Introduction
The FEANGLI Red Light Therapy Knee Brace Model YD169 is designed to provide targeted relief for various body areas, including the knees, elbows, and shoulders. This wireless device integrates 660nm visible red light with 850nm invisible near-infrared technology, offering multi-level support for pain relief and recovery. It features a built-in 3000mAh rechargeable battery for cordless operation and a simple one-button control for ease of use.
Key Features:
- Dual-Wavelength Light Therapy: Combines 660nm red light for surface tissue revitalization and 850nm near-infrared light for deep penetration into joints and muscles.
- Adjustable Heating: Three-level heat therapy mode to deeply relieve tissue pain with adjustable temperature settings.
- Cordless Operation: Built-in 3000mAh battery provides 1-2 hours of use on a full charge, with USB-C charging.
- Universal Adaptability: Adjustable Velcro straps and an included 23-inch extension strap ensure a secure fit for various body types and areas.
- Automatic Shut-off: Device automatically turns off after 20 minutes of operation to prevent overuse.
Safety Information
- Consult a healthcare professional before use if you have any pre-existing medical conditions, are pregnant, or have sensitive skin.
- Do not use on broken or irritated skin.
- Avoid direct eye exposure to the red light.
- Do not use while sleeping or in situations where you cannot monitor the device.
- Keep out of reach of children and pets.
- Ensure the device is fully charged before initial use.
- Do not modify or disassemble the device.
- If you experience any discomfort or adverse reactions, discontinue use immediately.
Setup
- Unpack the Device: Carefully remove the Red Light Therapy Knee Brace and all accessories from the packaging.
- Charge the Device:
Locate the USB-C charging port on the device, typically near the power button. Connect the provided USB-C cable to the device and plug the other end into a compatible USB power adapter (not included). The indicator light will show the charging status (e.g., red for charging, blue for fully charged). A full charge takes approximately 2 hours.

Image: The FEANGLI Red Light Therapy Knee Brace with its USB-C charging cable. The charging port is located near the power button.
- Familiarize Yourself with Controls: Identify the single power button on the device. This button controls power and heat settings.
Operating Instructions
- Apply the Brace:
Unfasten the Velcro straps. Position the brace over the desired area (knee, elbow, shoulder) ensuring the red light panels are directly in contact with the skin. Secure the straps firmly but comfortably. Use the included 23-inch extension strap if needed for larger areas or a more secure fit.
Video: Demonstrates how to apply the Red Light Therapy Knee Brace to the knee, securing it with the Velcro straps. The red lights are visible during operation.
- Power On: Press and hold the power button for 2 seconds to turn on the device. The red lights will illuminate, and the device will start in the lowest heat setting.
- Adjust Heat Settings:
Press the power button briefly to cycle through the three heat intensity levels (low, medium, high). The indicator light around the power button may change color to indicate the current setting (e.g., green for low, red for high, or a pulsating mode).
Video: Shows the power button and how to cycle through the different heat and light intensity levels. The red lights are clearly visible during operation.
- Treatment Duration: The device is programmed to automatically shut off after 20 minutes to prevent overuse. It is recommended to use the device once daily for optimal results.
- Power Off: To turn off the device manually, press and hold the power button for 2 seconds.
Maintenance
- Cleaning: Wipe the surface of the device with a soft, damp cloth. Do not immerse the device in water or use harsh chemicals.
- Storage: Store the device in a cool, dry place away from direct sunlight when not in use.
- Battery Care: Charge the device regularly, even if not in frequent use, to maintain battery health.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Low battery or not charged. | Charge the device fully using the provided USB-C cable. |
| Red lights are dim or flickering. | Low battery. | Recharge the device. |
| Device does not heat up. | Incorrect heat setting or device malfunction. | Cycle through heat settings. If problem persists, contact customer support. |
| Device turns off too quickly. | Automatic 20-minute shut-off activated. | This is normal operation. Restart if further treatment is desired, but adhere to recommended usage guidelines. |
Specifications
- Model Number: YD169
- Brand: feangli
- Light Wavelengths: 660nm (Red Light), 850nm (Near-Infrared Light)
- Battery Capacity: 3000mAh rechargeable
- Charging Interface: USB-C
- Operating Time: 1-2 hours on a full charge
- Automatic Timer: 20 minutes
- Material: Soft composite diving material
- Adjustability: Adjustable Velcro straps, includes 23-inch extension strap
- Item Weight: 14.8 ounces
- Package Dimensions: 8.5 x 5.43 x 2.6 inches
- UPC: 749877893673
Warranty & Support
The FEANGLI Red Light Therapy Knee Brace Model YD169 is backed by a full 2-year manufacturer’s warranty, which includes hassle-free returns and exchanges. For any questions, concerns, or support needs, please contact our dedicated customer service team, available 24/7.
Customer Service: Please refer to the contact information provided in your product packaging or visit the official feangli website for support details.