1. Introduction and Overview
The Kemei KM-5021 is a versatile 3-in-1 rechargeable trimmer and clipper designed for precise grooming. It features durable construction and rounded-tip blades for smooth skin contact, minimizing irritation. The device offers adjustable length settings, from a 0.5mm close shave without a comb to a 10mm full beard trim, allowing for various styling options. Its compact design and USB charging compatibility ensure portability and convenience.

Image: The Kemei KM-5021 trimmer shown with its packaging and various accessories.
2. Safety Information
Please read and understand all safety instructions before using the Kemei KM-5021 trimmer.
- Warning: Not suitable for infants or children. Keep out of reach of children.
- Protect the device from water and moisture to prevent electric shock. Do not use near water or in wet conditions.
- Use only with the provided power plug and USB charging cable.
- Avoid direct skin contact with sharp blades to prevent injury. Handle blades with care.
- In case of eye contact with any part of the device or accidental injury, seek medical advice immediately.
- Ensure regular cleaning and maintenance for optimal performance and hygiene.
- This product is designed for daily use.
3. Package Contents
Verify that all items are present in the package:
- Kemei KM-5021 Trimmer Unit
- USB Charging Cable
- Cleaning Brush
- Lubricating Oil
- Multiple Guide Combs (4 pieces)

Image: Close-up view of the Kemei KM-5021 accessories, including the USB charging cable, cleaning brush, lubricating oil, and four guide combs.
4. Setup
4.1 Charging the Trimmer
- Ensure the trimmer is switched off.
- Connect the USB charging cable to the charging port at the bottom of the trimmer.
- Plug the other end of the USB cable into a compatible USB power adapter (not included) or a USB port.
- Allow the trimmer to charge fully before first use. The indicator light (if present) will show charging status.
4.2 Attaching Guide Combs
The Kemei KM-5021 comes with multiple guide combs to achieve different hair lengths.
- Select the desired guide comb for your preferred hair length.
- Align the comb with the trimmer blade.
- Gently push the comb onto the blade until it clicks securely into place.
- To remove, gently pull the comb away from the blade.

Image: The Kemei KM-5021 trimmer displayed with its various guide combs, illustrating how different lengths can be achieved.
5. Operating Instructions
5.1 General Trimming
- Ensure the trimmer is fully charged.
- Attach the appropriate guide comb for your desired hair length (refer to Section 4.2). For a 0.5mm close trim, use without a comb.
- Press the power button to turn on the trimmer.
- Hold the trimmer with the blades facing the area you wish to trim.
- Move the trimmer against the direction of hair growth for an even cut.
- Use slow, controlled movements.
- After use, turn off the trimmer and clean it (refer to Section 6).
5.2 Adjusting Length Settings
The trimmer allows for various length settings. With guide combs, you can achieve lengths up to 10mm. Without a guide comb, the trimmer provides a 0.5mm trim.
6. Maintenance
Regular cleaning and maintenance will ensure the longevity and optimal performance of your Kemei KM-5021 trimmer.
6.1 Cleaning the Blades
- Turn off the trimmer and disconnect it from any power source.
- Remove any attached guide comb.
- Use the provided cleaning brush to brush away loose hairs from the blades.
- For a more thorough clean, the blades can be carefully detached (refer to specific instructions if provided in the physical manual) and rinsed under running water. Ensure blades are completely dry before reattaching.
- Do not immerse the entire trimmer unit in water.
6.2 Oiling the Blades
- After cleaning and drying the blades, apply 1-2 drops of the provided lubricating oil onto the blades.
- Turn on the trimmer for a few seconds to allow the oil to distribute evenly.
- Wipe off any excess oil with a soft cloth.
- Oiling should be done regularly, especially after cleaning or if the trimmer feels sluggish.
7. Troubleshooting
If you encounter any issues with your Kemei KM-5021 trimmer, please refer to the following common solutions:
- Trimmer not turning on: Ensure the trimmer is fully charged. Check the charging cable and power source.
- Poor cutting performance: Clean the blades thoroughly and apply lubricating oil. Ensure no hair is stuck in the blades. The blades may need sharpening or replacement if they are dull (contact support).
- Unusual noise: Clean and oil the blades. If the noise persists, discontinue use and contact customer support.
For persistent problems not covered here, please contact Kemei customer support.
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Kemei |
| Model Number | KM-5021 |
| Power Source | Battery Powered (Rechargeable) |
| Connector Type | USB |
| Blade Material | Stainless Steel |
| Number of Heads | 4 (Guide Combs) |
| Number of Speed Settings | 1 |
| Target Audience | Men |
| Recommended Uses | Facial and Body Hair Trimming |
| Item Weight | 300 grams |
| Country of Origin | China |
9. Warranty and Support
This Kemei KM-5021 product comes with a manufacturer's warranty for 2 years from the date of purchase. For warranty claims, maintenance, or further details, please contact the manufacturer/agent or Amazon customer service.
For additional support or inquiries, please refer to the contact information provided with your product packaging or visit the official Kemei website.





