We compared the top Head Shaver products so you can quickly spot the strongest options for value, features, and everyday performance.
Magnetic detachable blades for easy cleaning.
Dual-speed power adjusts to shaving needs.
Long battery life enhances convenience and use.
Versatile attachments for complete grooming solutions.
Waterproof design enables convenient wet/dry use.
Cordless feature offers easy portability and flexibility.
Flexible blades adapt to head contours.
Long battery life for extended use.
Waterproof design allows shower shaving.
360° flexing head for seamless contouring.
ComfortCut blades ensure a gentle shave.
Suitable for both men and women.
Adjustable 3-speed settings for personalized shaving.
LCD display for easy battery monitoring.
Versatile use for head, face, and beard.
Ergonomic design for comfortable, easy handling.
USB-C rechargeable for convenient, quick charging.
Waterproof for versatile wet or dry use.
Turbo speed feature ensures quick shaving.
Waterproof design allows easy cleaning.
Versatile 5-in-1 grooming attachments included.
Innovative Octo-Flex design for smooth shaving.
Comfortable grip for easy handling.
Compact size perfect for travel use.
Efficient micro-comb technology ensures a close shave.
Waterproof design allows for easy cleaning.
Fast charging feature provides convenience on-the-go.
Ergonomic design ensures comfortable handling.
Provides a smooth and close shave.
Long-lasting battery for extended use.
Head shavers utilize either rotary or foil cutting mechanisms to trim very short scalp hair. Rotary models feature multiple floating cutting sections that glide over curved surfaces, while foil models employ a thin perforated foil over reciprocating blades. While convenience is a primary benefit, a good product should also shave consistently across the entire scalp, avoid excessive pulling or pressure, be easy to clean, and come with safe instructions for charging and water exposure.
Performance evidence beyond marketing claims is crucial. Instead of relying on the number of heads, motor speed, or claimed residual hair length, look for independent laboratory or consumer panel reports. These should specify the exact product tested, sample size, hair regrowth intervals, test conditions, comfort levels, rate of missed hairs, closeness of shave, and time taken. Most products lack such detailed testing, so claims like “closest,” “smooth,” “fast,” “360-degree coverage,” “zero irritation,” or “no cuts” are marketing statements unless supported by disclosed tests. Runtime claims are also unreliable without proper testing; reviews often conflict on battery life and charging times.
Skin safety depends on actual use rather than labels such as “skin-friendly,” “hypoallergenic,” or “SkinSafe.” A stronger safety record involves independent dermatological or human-use testing specific to each model, including details about participants and adverse reactions. Instructions should cover shaving with longer hair, handling damaged cutters, applying pressure, cleaning procedures, and use on irritated or broken skin. A device that can be rinsed isn’t automatically shower-safe, and an IP rating doesn’t guarantee safety in all water conditions. Verify the product’s ingress protection, overall configuration, and whether instructions require unplugging prior to rinsing or prohibit charging near water.
Electrical safety claims require separate verification. An independent listing from a recognized testing laboratory—such as UL, Intertek’s ETL, or CSA—is essential. Seller badges, CE declarations, or vague safety claims don’t confirm compliance. Most reviews find no exact-model listing from these labs for many products, though some manual reports UL markings on the product itself. However, the absence of a compatible, certified power supply (e.g., 5 V, at least 1 A) indicates incomplete certification.
Ease of cleaning is a practical safety concern. Prefer models that open or detach easily without damaging the cutters, feature accessible hair chambers, and can be cleaned with a brush or rinse. Clear instructions for replacing parts and an established maintenance schedule help prevent premature disposal. Genuine replacement cutters, warranty coverage, and repair options are also important. Many rechargeable batteries have end-of-life disposal considerations; reviews repeatedly note the lack of removal instructions or take-back programs. Follow manufacturer guidelines and use appropriate collection channels, especially since lithium-ion batteries shouldn’t be discarded with household trash or curbside recycling.
Overall, the reviewed products lack independent, human-use evidence confirming low risks of cuts, pulling, razor bumps, or irritation. Many also lack verified electrical safety and ingress protection testing, even when claiming waterproof or shower-safe capabilities. Those with skin conditions such as irritation, open wounds, folliculitis, eczema, psoriasis, recent treatments, or shaving sensitivities should be cautious. Avoid relying on no-cut claims or charging near water; discontinue use if experiencing heat, pain, pulling, or redness during shaving.
In summary, prioritize thorough, independent testing and clear safety instructions to ensure a safe and effective head shaving experience.
The scores listed below evaluate the provided products across specific health, evidence, and ecological criteria. A higher score indicates greater support or fewer identified gaps in that area; however, it does not convert a manufacturer's claim into independent validation.
This assessment evaluates cuts, pinching, pulling, razor bumps, and irritation experienced during typical scalp use. It is important because a floating rotary head or foil can still exert pressure on or abrade the skin. The scores provided range from 58 to 74: products with higher scores generally had clearer safety precautions or fewer issues. However, none of the products included independent, model-specific human-use or dermatological studies confirming their low irritation potential.
This encompasses issues related to overheating, fire, burns, electric shock, and unsafe charging for the entire shaver and its provided charging system. It is important because many models utilize rechargeable lithium batteries and are intended for bathroom use. Safety scores range from 62 to 82. Higher-rated products typically include specific charging safety instructions, and the top-scoring item features a manual referencing a UL certification mark; however, most reviews indicate that there is no precise model-specific NRTL listing available.
This assesses whether claims of wet, rinse, shower, and waterproof capabilities are backed by an ingress protection rating, testing, and proper safe charging guidance. It is important because water exposure combined with charging can be dangerous. Scores range from 52 to 76. Products with higher scores typically had clearly defined limits or instructions, whereas those with lower scores often displayed conflicting ratings, lacked a specified IP rating, or did not have an independent ingress report for the exact model.
This measure assesses the ability to effectively remove hair, skin debris, and shaving products without leaving residues or damaging the cutters. It is important because scalp debris can remain trapped within a multi-head assembly. The scores range from 69 to 85. The highest-rated products feature removable or openable heads, accessible chambers, rinse-and-brush cleaning steps, and practical drying instructions. Conversely, lower-scoring products lack comprehensive cleaning routines or have more cumbersome cutter designs.
This assesses whether worn cutters and other components can be replaced rather than discarding the entire shaver, as well as whether support remains practical. This is important because head-shaver cutters are consumable items. Scores range from 61 to 85. Products with higher scores featured genuine, compatible replacement heads and indicated clear replacement intervals. In contrast, lower-scoring products lacked known availability, had sold-out parts, no clear pathway for replacements, or lacked proper repair documentation.
This assessment evaluates battery identification, safe removal or return procedures, disposal instructions, and provides a practical recycling pathway within the U.S.. The importance lies in the fact that nearly all supplied products incorporate rechargeable batteries, which are often not accessible for user maintenance. The scores range from 68 to 76. Higher-rated products typically offer clearer guidance on battery handling or Call2Recycle programs. However, most products lack a take-back program or explicit removal procedures, leaving end-of-life management primarily up to the consumer.
This metric assesses whether an independent certification organization has officially listed the specific product to an applicable safety standard. It is especially important for rechargeable shavers used near water. The scores range from 68 to 82. The top-scoring product featured a manual indicating a UL listing mark, whereas most reviews found no verifiable UL, ETL, CSA, or other OSHA-recognized NRTL certifications for either the entire product or its charger.
This assessment separately evaluated factors such as proximity, contour coverage, comfort, thoroughness, and shaving time under specified conditions. These metrics are important because factors like head count, RPM, and claimed blade lengths do not reveal how effectively a shaver performs on a scalp. The scores range from 68 to 70; however, this narrow range indicates a lack of comprehensive evidence, as none of the products included in the test had independent, precise-model shave trials provided.
This metric evaluates whether claims like waterproof, irritation-free, closest fit, or no nicks are supported by the available evidence and whether their limitations are acknowledged. It is important because many listings make absolute promises regarding comfort or safety. Scores range from 48 to 78, with higher-scoring products providing clearer limitations or more specific instructions. In contrast, lower-scoring products tend to combine broad claims with conflicting specifications or lack any supporting testing methods.
This assessment determines whether the brand, model, and charger have a documented safety history and whether specific solutions are provided for any issues. It is important because a thorough search does not equate to certification or evidence of zero safety incidents. Scores range from 70 to 78. Products with higher scores generally offered clearer warranty or support details and showed no unresolved issues. Additionally, reviews did not indicate any product-specific CPSC recalls for the listed models.
The manufacturer specifies that the product includes stainless steel cutting components, a lithium-ion battery, USB-C charging, and an IPX6 rating for wet use. The user manual offers essential safety guidance, such as disconnecting the shaver from the power cord before cleaning, keeping the cable and charger dry, and avoiding use of damaged blades. It also explains how to open the cutting head for rinsing the blades and hair compartment, facilitating routine cleaning and debris removal. However, key information is still missing. There is no record of an exact product listing in major U.S. independent electrical certification databases, and no publicly available independent tests for ingress protection or suitability for scalp use have been found. Additionally, no recalls, regulatory warnings, or incident reports related to this product or brand have been identified in the sources searched. Although the manufacturer offers a replacement head, there is no publicly available, practical process for removing, returning, or recycling the lithium-ion battery once it reaches the end of its service life.
This product is ideal for an adult with a well-maintained bald scalp seeking a compact, cordless rotary shaver featuring an easily accessible, washable cutting area. It is best suited for users who are comfortable following the manual’s safety instructions, such as disconnecting the charger before cleaning, keeping connectors dry, and inspecting the cutting head for damage. The replacement head, sold separately, is beneficial for those who prefer a designated consumable replacement rather than disposing of the entire shaver. Battery life should be considered approximate rather than exact, and users should expect variability in runtime.
This product is not recommended for individuals with highly sensitive skin, active scalp irritation, open wounds, folliculitis, or a history of significant razor bumps, as there is no independent scalp-tolerance testing available. It is also unsuitable for households that require electrically certified products, especially when intended for bathroom or shower use. Do not use it underwater or charge it near water. Consumers who require documented battery recycling, user-replaceable batteries, or verified close-shave results should select a product with published evidence supporting those features.
Freebird imposes some practical usage restrictions. According to their guidance, users should disconnect the shaver before showering, avoid submerging it or exposing it to strong water jets, rinse the blade separately for thorough cleaning, and let the device dry completely before charging. While these instructions are helpful, their claimed IPX6 water resistance rating is provided by the manufacturer, and no independent testing reports verifying this ingress protection have been found. The brand offers replacement shaving heads and recommends a replacement interval, which can help extend the device's lifespan. However, they do not publish a repair guide for the internal battery, nor do they provide instructions for removing the battery or a product take-back program. Freebird states that the current original battery is a 600 mAh lithium-ion unit, although their catalog refers to it as lithium-polymer. Regardless, U.S. EPA guidelines advise against disposing of lithium-ion batteries and devices containing them in household trash or curbside recycling. No recalls or safety actions from the CPSC or other regulators regarding this product were identified in reviews conducted through August 16, 2026.
This product is designed for adults with very short scalp hair who are comfortable using small, circular motions. It combines a rechargeable clipper with basic grooming attachments in a single device. It is best suited for regular maintenance rather than removing long hair in one pass, as Freebird recommends pre-trimming longer hair beforehand. The removable shaving head may appeal to users willing to regularly maintain the cutting system and follow the instructions to dry the device before charging after wet use.
This product is not ideal for individuals with very sensitive scalp or neck skin who require independently verified proof of low irritation, pulling, or razor bump risk. Additionally, it is unsuitable for households that need independently certified electrical safety for rechargeable bathroom devices, as no publicly recognized NRTL certification for the complete product and its charging system could be found. Do not use the device while it is plugged in, submerged in water, or exposed to powerful water jets. Users looking for publicly documented options for battery removal or recycling should seek more information.
The health-related features offered are practical but lack independent verification. MAXGROOM features a removable magnetic head that can be rinsed, with an expected replacement interval of approximately four months if pulling or discomfort occurs. While keeping the cutter free of hair and replacing worn heads may help reduce unnecessary pulling, there are no independent studies on scalp safety, dermatological effects, or controlled shaving performance for this product. Additionally, the manufacturer claims IPX6 water resistance; however, no independent testing reports or recognized electrical certifications for the entire device have been found. The product is described as powered by a rechargeable lithium-ion battery. Its user manual advises removing the battery for recycling but does not provide a safe, detailed removal method or specify a brand take-back program. According to EPA guidance, lithium-ion batteries and devices containing them should not be disposed of in household trash or curbside recycling, as damaged batteries pose a fire risk. The manufacturer offers replacement heads to extend the cutter's lifespan but does not specify any repair procedures for the batteries themselves.
This product is ideal for adults who already keep a closely shaved or bald scalp and need a compact, cordless rotary shaver for regular touch-ups. It is best suited for individuals comfortable with a routine that involves removing the head for rinsing hair and letting the device dry before storing. The USB-C input is convenient for users who prefer a widely used cable type. Additionally, the product comes with a one-year warranty, providing a clear pathway for support if any issues arise during that time.
This product is not ideal for individuals with highly reactive, damaged, infected, or recently treated scalp skin, as there is no evidence of dermatological or human adverse-event testing for it. It is also unsuitable for users who require independently certified electrical safety, verified shower performance, or proven close-shave results prior to use. Households with children should keep the cutter and charging cable out of reach. Additionally, those who need dependable runtime planning should exercise caution, as the manufacturer’s information provides conflicting details regarding battery life and operating times.
The most reliable safety information is operational rather than independently certified. Philips' manual recommends using a certified 5 V, at least 1 A SELV power supply and specifies an IPX4-rated power unit if charging occurs in a damp bathroom. It advises keeping the cable and power supply dry, operating the shaver cordless near water, discontinuing use if it becomes hot, emits a bad smell, discolors, or charges slowly, and only using it on intact scalp skin. No specific NRTL listing for a product or publicly available independent scalp-use study was identified. Regarding durability, Philips offers genuine HS740 cutter heads compatible with their device and recommends replacing them every six months. The manual states the shaver contains a built-in lithium-ion battery and advises that the battery be disposed of through proper collection channels rather than household waste. It also notes that battery removal should be performed by a qualified professional, which can limit repair options. U.S. users can utilize battery-recycling services for rechargeable batteries, but no specific Philips U.S. take-back program was found.
This product is ideal for adults with very short scalp hair who are looking for a cordless rotary shaver for everyday home use and are willing to follow the provided care instructions. It is especially suitable for those who appreciate the option to rinse the shaver and use it with gel or foam in the shower, while keeping the USB power supply dry and separate. Additionally, it is suitable for users who are comfortable replacing the genuine cutting heads every six months, as recommended by Philips, rather than treating the cutter as a permanent component.
Shaving over broken skin, scalp growths, active skin conditions, or severe scalp irritation is not recommended, as Philips explicitly advises against such use. Individuals who require independently verified low-irritation performance, an independent electrical safety certification for the entire product, or a provided wall charger should seek documentation confirming these features, as this product does not publicly offer such information. Additionally, it is not suitable for users who want a easily replaceable battery or for those planning to shave hair longer than 2 mm.
Ufree detects a lithium battery, zinc-alloy housing, etched steel cutters, and titanium-coated foils in their product. They also offer a replacement head that includes one foil assembly and two cutters, allowing extended use beyond the initial worn cutting system. However, the company does not specify a recommended replacement interval, provide detailed battery service instructions, specify battery chemistry beyond lithium, or have a documented take-back program. While the company uses general claims of Certified Safety & Quality, they do not specify any certifying organization, standard, or certificate related to the product. No specific NRTL listing for the exact model was found in public registries, and there are no independent skin or electrical safety test reports available for this product. Additionally, searches for recalls or incidents did not reveal any specific safety actions or notices issued in the United States. At the end of its life, the lithium-powered product should not be disposed of in household trash or curbside recycling. The EPA recommends using a separate battery or household hazardous waste collection service for proper disposal.
This product is suitable for adults who keep very short stubble on their face or scalp, prefer a cordless foil shaver, and are comfortable using it as a dry grooming tool. It is also ideal for individuals who appreciate the availability of replacement heads sold by the manufacturer and can verify compatibility with their model before purchasing parts. The claimed 90-minute runtime and USB charging feature are convenient for regular home use or travel, though these specifications are provided by the manufacturer and have not been independently verified.
This product is not suitable for individuals who require documented protection for highly reactive skin, frequent razor bumps, ongoing scalp irritation, cuts, or dermatologic conditions. There is no model-specific safety data indicating low irritation or reduced nick rates for human use. Additionally, it should not be used for shower shaving or rinsing under water, as the manufacturer does not specify an IP rating or instructions for wet use. For workplace applications where certified electrical equipment is required, users should select a product that has an exact-model NRTL listing and a clear certification mark.
The product features a rechargeable internal battery and a USB-C charging cable. However, no specific NRTL certification, battery chemistry details, charging system certification, or ingress protection test reports were found in the checked sources. OSHA clarifies that an authentic NRTL mark signifies compliance with relevant safety standards, but Hummingbird's materials do not display such a mark or specify a standard for this product. The official website describes it as water-resistant, whereas the marketplace listing claims it is waterproof. This discrepancy is important because no IP rating or independent testing for wet conditions has been identified. One of the key waste-reduction features is the optional magnetic replacement head. Hummingbird states that it is compatible with this product and recommends replacing it every 3 to 6 months. This can help prevent discarding the entire shaver when the cutters wear out. However, information about the battery's serviceability or manufacturer take-back program is not provided. According to EPA guidance, lithium-ion batteries and devices containing them should not be disposed of in household trash or curbside recycling. Nonetheless, the product's battery chemistry has not been specified. No CPSC recalls or public safety actions related to this product have been found during this review.
This product is designed for adults who already maintain a bald or very short hairstyle and are looking for a compact, cordless rotary shaver with a removable cutting head. It is ideal for users comfortable with periodically replacing the cutting assembly and ensuring the shaver is dried before storage and charging. The package includes a travel case, travel lock, USB-C cable, and is suitable for both wet and dry use as specified by the manufacturer. It is well-suited for everyday grooming at home and travel, but users should note that water resistance is not independently verified for shower use.
This product is not ideal for individuals with highly sensitive or reactive scalp skin, active folliculitis, open wounds, a history of severe razor bumps, or those needing proven low-irritation results. Such users should consult specific clinical data or seek professional advice, which is not available here. Additionally, it is unsuitable for households that require independently certified electrical safety or verified protection against water exposure during shower use. Do not charge the device when it is wet, and do not rely solely on the waterproof claims listed in the marketplace, as the manufacturer's specifications are more limited.
The primary health-focused design feature is ease of cleaning. The cutter head is described as magnetic and removable, with user instructions recommending rinsing it only after detaching it from the charging cable. Users are advised to then drain and air-dry the part. The instructions also caution against charging with wet hands, using damaged cutting components, or applying the product on irritated skin. While these guidelines are reasonable, they are manufacturer instructions and do not constitute independent validation of human safety or electrical safety. No specific NRTL certification, independent IPX7 water resistance testing report, recalls, or regulatory actions were found in the sources examined. The product is said to contain a lithium battery, but seller materials do not specify the exact chemistry, explain how to remove the battery, or provide guidance on battery disposal. When the product reaches the end of its life, it should be disposed of through electronic recycling facilities or household hazardous waste programs, rather than regular household trash or curbside recycling.
This product is ideal for adults with very short scalp hair who prefer a single cordless device for regular touch-ups. It requires following cleaning and drying procedures after each use. The removable head and included attachments make it suitable for those who prioritize basic grooming versatility over achieving the closest shave. It is best suited for users who are comfortable using a dry USB charging source and replacing the cutter head periodically for maintenance.
This product is not suitable for individuals with damaged, inflamed, highly sensitive, or infection-prone scalp skin, as there is no evidence of controlled human safety testing, and the instructions recommend against use on irritated skin. It is also not appropriate for households that require independently certified electrical devices for wet bathroom environments, or for users seeking documented, tool-free battery replacement or a manufacturer-approved battery recycling process. Additionally, avoid charging the device in bathrooms or near water to ensure safety.
The safety documentation is helpful but incomplete. MAXGROOM advises users to remove the head, rinse the blade assembly, dry all parts before storage, keep the charging port dry, and cease use if the device becomes unusually hot, emits a burning smell, or makes abnormal noises. These are reasonable operating guidelines, but they do not replace independent electrical safety certification or a published scalp-use study. Public searches did not find an official UL, ETL, CSA, or equivalent NRTL listing for this product, nor are there any recalls or regulatory warnings associated with it. The product is described as powered by a rechargeable lithium-ion battery, but there is no available procedure for removing the battery or a take-back program. The manufacturer’s instructions for another head-shaver model recommend removing lithium-ion batteries for local recycling, though this guidance has not been verified for this specific device. U.S. EPA guidelines state that rechargeable lithium batteries and devices containing batteries should not be disposed of in household trash or curbside recycling programs.
This product is designed for adults who already have very short or shaved scalp hair and need a small, cordless rotary tool for routine touch-ups, travel, or gym bag convenience. Weighing approximately 210 grams, it features a travel lock, purported USB-C charging, a detachable head, and an easy rinse-cleaning method—ideal for users who prioritize compact storage and simple maintenance. It is best suited for those comfortable considering the manufacturer’s claims about wet-use capability, runtime, and comfort as informational rather than independently verified performance data.
This product is not suitable for individuals with easily irritated, damaged, infected, sunburned, or clinically sensitive scalp skin, as there is no specific human irritation or dermatological testing available for it. Consumers looking for an electrically certified product for bathroom use should select one with a verified NRTL listing that covers the entire charger and shaver. Additionally, it may not be ideal for users who prioritize close or quick shaves, or who need assured access to replacement cutters and serviceable battery components over the long term.
The available documentation describes a foil shaving system featuring two blades, a removable shaving head, and claims the use of titanium for the blades. It provides basic instructions to turn off the device before cleaning, to rinse and air-dry the shaving head, and to keep the charging port dry before connecting it to power. However, these instructions are issued by the manufacturer and do not replace any published dermatological or scalp-use studies. No independent testing reports were found that evaluate the product's cutting efficiency, irritation potential, pulling, or overall shaving performance. Additionally, there have been no public U.S. recalls or safety actions related to this brand or product. It is important to note that this does not imply third-party electrical certification. Information regarding the battery chemistry, whether the battery is removable, recycling instructions, take-back programs, replacement parts, or repair options was not found. According to EPA guidelines, rechargeable batteries and devices containing batteries should not be disposed of in household trash or curbside recycling but should be taken to appropriate collection programs for batteries or electronics.
This product is ideal for adults seeking a compact cordless foil shaver primarily for managing short facial stubble, occasional detail trimming, and traveling light. Its features include a 100-minute runtime, a charging indicator, a travel lock, and a protective cap, making it easy to use for individuals who can charge the device when dry and are cautious about the waterproof claim. It is best suited for users who do not require verified scalp-shaving capabilities or extensive replacement part support for long-term use.
This product is not ideally suited for individuals looking for a dedicated head shaver for a bald scalp, especially those with very sensitive or bump-prone skin, or for achieving a close shave that follows scalp contours. Such users require model-specific human testing and more explicit guidance regarding irritation risks. Additionally, it is not suitable for households that need verified electrical certification, reliable performance in the shower, easily accessible replacement cutters, repair services, or clear instructions for battery disposal. Avoid charging the device near water and do not rely on the inconsistent claims regarding wet use.
Freebird features an 800 mAh lithium-ion battery and promotes the product as IPX7 rated for use in the shower. The company also provides a specific cleaning procedure: detach the cutting head, rinse it, brush out any remaining hair, and allow it to dry. A hands-on reviewer confirmed that the blades can be opened for cleaning and drying. While these are beneficial hygiene features, they do not replace the need for an independent ingress protection test or dermatological safety evaluation. No relevant CPSC recall information was found in the U.S. recall databases. Freebird offers a three-year limited warranty on the device and sells replacement blade refills to extend the product's use. However, there is no publicly available information about specific battery recycling programs, take-back schemes, detailed battery chemistry beyond lithium-ion, or guidance on safe battery removal. As a result, the battery likely remains a concern at end-of-life disposal.
This product is ideal for adults with very short scalp hair who need a versatile cordless tool for regular maintenance shaving, basic trimming, and occasional wet use. It is best suited for those comfortable with cleaning and drying the detachable blade head after each use, frequently replacing the consumable blades, and charging via USB. The available evidence most applies to daily or every-few-days scalp upkeep. Additionally, its larger hair chamber and removable cutting assembly make it suitable for users who prefer simple rinsing and brushing over a sealed, disposable head.
This product is not suitable for individuals with active scalp wounds, a history of severe razor bumps, contact dermatitis, or who require clinically verified safety for sensitive skin. Users should not interpret the irritation-free claims as medical or dermatological assurances. It is also not appropriate for those needing third-party electrical certification, independently tested waterproofing, or a wall adapter with verified safety standards. For hair longer than approximately 3 mm, it is recommended to trim beforehand, as the manufacturer advises this limit for optimal performance.
