Introduction
Thank you for choosing the Supreme Trimmer Testii STH120 Body Groomer. This device is designed for precise and safe grooming of sensitive areas and the entire body. Please read this manual thoroughly before first use to ensure proper operation, maintenance, and safety.
Important Safety Information
- Always use the trimmer with caution to avoid cuts.
- Do not submerge the trimmer in water; rinse it under running water only.
- Avoid using the trimmer while charging to prevent electrical hazards.
- Always unplug the trimmer before cleaning or storing.
- Keep the trimmer away from children and pets.
- Always replace the guard after use and store the trimmer properly to prevent bacterial growth.
Package Contents
Your Supreme Trimmer Testii STH120 package includes the following items:
- Supreme Trimmer Testii STH120 Body Groomer
- 1mm Trimming Guard
- 3mm Trimming Guard
- 5mm Trimming Guard
- Cleaning Brush
- Travel Bag
- USB-C Charging Cord
- User Guide (this manual)

Image: The Supreme Trimmer Testii STH120, three trimming guards, a cleaning brush, a USB-C charging cable, and a travel bag, all laid out on a surface.

Image: The Supreme Trimmer Testii STH120, its retail packaging, and included accessories such as guards, charging cable, and travel pouch.
Key Features
- Sensitive Area Precision: Designed with a skin-safe blade system to minimize nicks and irritation, suitable for groin, bikini line, underarms, and full body grooming.
- Waterproof Design: IPX6 rated for shower use and easy cleaning. Optimal performance is achieved on dry skin for the closest results.
- USB-C Fast Charging: Offers convenient and quick charging with a USB-C port.
- Long Runtime: Provides up to 90 minutes of cordless operation on a full charge.
- Ergonomic Grip: Lightweight design for comfortable and controlled handling.
- Adjustable Guards: Includes 1mm, 3mm, and 5mm trimming guards for customizable hair length.
- Dual-Edge Blade: Ensures clean and efficient trimming.

Image: Demonstrates the multipurpose use of the trimmer for different body areas such as bikini/groin, body, armpit, and legs.

Image: A close-up view of the trimmer's blade, emphasizing its flexible rotating, dual-edge, easy-clean, and skin-safe properties.

Image: The trimmer being rinsed under water, demonstrating its waterproof capability.

Image: The three included trimming guards (1mm, 3mm, 5mm) for customizing trim length.
Setup and Initial Use
Charging the Trimmer
- Before first use, fully charge the trimmer.
- Connect the USB-C charging cord to the trimmer and a compatible USB power source (not included).
- The LED indicator on the trimmer will show charging status. A full charge takes approximately 90 minutes.
- Once fully charged, disconnect the trimmer from the power source.

Image: The trimmer being charged via its USB-C port, illustrating the charging process.
Attaching and Removing Trimming Guards
- Ensure the trimmer is turned off before attaching or removing guards.
- Select the desired trimming guard (1mm, 3mm, or 5mm).
- Align the guard with the trimmer head and gently push until it clicks into place.
- To remove, gently pull the guard away from the trimmer head.
Operating Instructions
General Trimming
- Press the power button to turn on the trimmer. The LED light will illuminate.
- For best results, use the trimmer on dry skin. While waterproof for wet use, dry performance offers the closest results.
- Move the trimmer slowly and against the direction of hair growth. This technique helps prevent nicks and ensures an even trim.
- Apply light pressure. Do not press too hard against the skin.
- For sensitive areas, consider using one of the trimming guards to maintain a slight length and further reduce the risk of irritation.
- After use, press the power button to turn off the trimmer.

Image: A hand holding the Supreme Trimmer Testii STH120, demonstrating its comfortable ergonomic design during use.
Care and Maintenance
Cleaning the Trimmer
- Ensure the trimmer is turned off and disconnected from any charging cable before cleaning.
- Remove the trimming head by gently pushing it off the main body.
- Use the included cleaning brush to remove any loose hairs from the blade and inside the trimmer head.
- Rinse the blade and trimmer head under running water. Do not submerge the main body of the trimmer.
- Allow all parts to air dry completely before reattaching the head or storing the trimmer.

Image: A sequence showing how to detach the trimmer blade and clean it under running water, emphasizing the easy-clean design.
Blade Replacement
For optimal performance, it is recommended to replace the blade periodically. Replacement blades (models RH110 and RH120) are available from Supreme Trimmer.
- Ensure the trimmer is off.
- Gently detach the old blade head.
- Align the new blade head with the trimmer body and press firmly until it clicks into place.

Image: A hand detaching the blade head from the Supreme Trimmer Testii STH120, showing the mechanism for removal.
Specifications
| Model Name | STH120 |
| Power Source | Battery Powered; Corded/Cordless Use |
| Battery Type | Rechargeable Lithium-Ion (Non-removable) |
| Battery Average Life | 90 minutes |
| Charging Time | Approximately 90 minutes |
| Charging Port | USB-C |
| Waterproof Rating | IPX6 |
| Blade Material | Stainless Steel |
| Included Guards | 1mm, 3mm, 5mm |
| Recommended Uses | Head to Toe Shaving |
| Manufacturer | Supreme Trimmer |
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Trimmer does not turn on. | Battery is depleted. | Charge the trimmer fully using the provided USB-C cable. |
| Trimmer pulls hair or causes irritation. | Trimming too fast or against the grain; dull blade. | Trim slowly and against the grain. Ensure the blade is clean. Consider replacing the blade if it's dull. |
| Trimmer not charging. | Faulty cable or power source; charging port obstruction. | Ensure the USB-C cable is securely connected. Try a different USB power source. Check the charging port for debris. |
| Reduced trimming performance. | Blade is clogged with hair or dull. | Clean the blade thoroughly. Replace the blade if cleaning does not restore performance. |
Warranty and Support
The Supreme Trimmer Testii STH120 comes with a 2-year warranty for factory defective multi-groomers. Warranty claims are processed through Supreme Trimmer customer service.
For customer service and warranty inquiries, please contact:
- Phone: 818-626-8065 (Monday - Friday, 8am-3pm PST)
- Email: support@supremetrimmer.com
