Introduction
Thank you for choosing the SUPRENT Adjustable Beard Trimmer. This manual provides essential information for the safe and effective use, maintenance, and care of your new trimmer. Please read these instructions thoroughly before first use and retain them for future reference.
Product Overview
The SUPRENT BT355BA-1A1 is a cordless electric beard trimmer designed for precision grooming. Key features include:
- IPX7 Waterproof Rating: Suitable for wet and dry use, allowing for easy rinsing under running water.
- Adjustable Precision Dial: Offers 39 length settings from 0.5 mm to 20 mm for versatile styling.
- USB-C Rechargeable: Provides convenient charging with an LED display for battery status.
- Smooth Trimming Experience: Equipped with a powerful motor and precise blade design to prevent hair pulling and skin irritation.
- Self-Sharpening Stainless Steel Blades: Ensures consistent cutting performance and durability.
Safety Information
To reduce the risk of electric shock, injury, or fire, always follow these basic safety precautions:
- Do not use this appliance near bathtubs, showers, basins, or other vessels containing water.
- Keep the appliance dry when charging.
- Always check the appliance before use. Do not use if the blades are damaged or broken, as this may cause injury.
- This appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
- Children should be supervised to ensure that they do not play with the appliance.
- Only use the charger supplied with the appliance.
- Do not immerse the charging adapter in water.
- Unplug the appliance before cleaning it with water.
Package Contents
Verify that all items are present in your package:
- SUPRENT BT355BA-1A1 Beard Trimmer
- Adjustable Guide Comb(s)
- USB-C Charging Cable
- Cleaning Brush
- User Manual
Setup
Initial Charging
Before using your trimmer for the first time, fully charge it. A full charge takes approximately 90 minutes and provides up to 60 minutes of cordless operation.
- Connect the USB-C charging cable to the trimmer's charging port.
- Plug the other end of the USB-C cable into a compatible USB power adapter (not included) or a USB port.
- The LED display will indicate the charging status. Once fully charged, the display will show 100%.

Attaching the Guide Comb
The trimmer features an integrated adjustable guide comb. To adjust the trimming length:
- Ensure the trimmer is turned off.
- Rotate the precision dial located on the trimmer body to select your desired cutting length. The available settings range from 0.5 mm to 20 mm.

Operating Instructions
Trimming Your Beard or Hair
- Ensure your beard or hair is clean and dry before trimming, unless performing a wet trim.
- Select the desired trimming length using the precision dial.
- Press the power button to turn on the trimmer.
- Hold the trimmer with the blades facing your skin. For an even trim, move the trimmer against the direction of hair growth.
- Use light pressure and smooth, even strokes.
- For detailing or precise lines, remove the guide comb and use the bare blades carefully.
- After trimming, press the power button to turn off the trimmer.

Wet Trimming
The SUPRENT trimmer is IPX7 waterproof, allowing for wet trimming. This can be beneficial for a smoother glide and easier cleanup.
- Ensure the trimmer is not connected to the charging cable before using it in wet conditions.
- You may use shaving foam or gel for a more comfortable wet shave.
- Important: Do not use the trimmer in the shower or immerse it completely in water for extended periods. It is designed to withstand rinsing and splashes.
Maintenance and Cleaning
Regular cleaning ensures optimal performance and extends the life of your trimmer.
Cleaning After Each Use
- Turn off the trimmer and unplug it from any charging source.
- Remove the guide comb (if attached).
- Use the provided cleaning brush to remove loose hairs from the blades and the trimmer body.
- Rinse the trimmer head and blades under running tap water. The IPX7 rating allows for easy and hygienic cleaning.
- Shake off excess water and allow the trimmer to air dry completely before storing or recharging.

Blade Care
The trimmer features self-sharpening stainless steel blades, which require minimal maintenance. However, for best performance:
- Periodically apply a small drop of light machine oil (not included) to the blades to ensure smooth operation.
- Avoid dropping the trimmer, as this can damage the blades.

Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Trimmer does not turn on. | Battery is depleted. | Charge the trimmer fully. |
| Trimmer pulls hair or cuts poorly. | Blades are dirty or dull. Hair buildup. | Clean the blades thoroughly. Apply a drop of oil to the blades. Ensure hair is dry before trimming (unless wet trimming). |
| Trimmer not charging. | Charging cable or adapter issue. | Ensure the USB-C cable is securely connected. Try a different USB power adapter or port. |
Specifications
| Model Number | BT355BA-1A1 |
| Power Source | Battery Powered |
| Battery Type | 1 AAA battery (included) |
| Charging Time | Approx. 90 minutes |
| Run Time | Up to 60 minutes (cordless) |
| Cutting Length Adjustment | 0.5 mm - 20 mm (39 settings) |
| Waterproof Rating | IPX7 (Whole Body Washable) |
| Blade Material | Stainless Steel |
| Connector Type | USB-C |
| Product Dimensions | 1.37 x 1.18 x 6.49 inches |
| Item Weight | 0.13 Kilograms (4.59 ounces) |
| Color | Black |
Warranty and Support
For information regarding warranty coverage, product support, or to contact customer service, please refer to the official SUPRENT website or the contact information provided with your purchase documentation. Keep your proof of purchase for warranty claims.