1. Introduction
Thank you for choosing the COMFIER Cordless Knee Massager. This device is designed to provide targeted heat and vibration massage therapy to your knee, shoulder, or elbow, aiming to alleviate discomfort and promote relaxation. Please read this instruction manual thoroughly before use to ensure safe and effective operation.
The COMFIER Cordless Knee Massager is designed to provide targeted heat and vibration therapy to the knee area.
2. Important Safety Instructions
WARNING: To reduce the risk of burns, fire, electric shock, or injury to persons, this product must be used in accordance with the following instructions:
- Always unplug the device from the power outlet immediately after charging and before cleaning.
- Do not use while bathing or showering.
- Do not place or store the device where it can fall or be pulled into a tub or sink.
- Do not immerse in water or other liquids.
- Never use pins or other metallic fasteners with this appliance.
- Close supervision is necessary when this appliance is used by, on, or near children, invalids, or disabled persons.
- Use this appliance only for its intended use as described in this manual. Do not use attachments not recommended by the manufacturer.
- Never operate this appliance if it has a damaged cord or plug, if it is not working properly, if it has been dropped or damaged, or dropped into water.
- Keep the cord away from heated surfaces.
- Never use while sleeping or drowsy.
- Never drop or insert any object into any opening.
- Do not operate where aerosol (spray) products are being used or where oxygen is being administered.
- Do not use on infants, invalids, or a sleeping or unconscious person.
- Do not use on insensitive skin or on a person with poor blood circulation.
- Check the skin in contact with the heated area of the appliance frequently to reduce the risk of blistering.
- Do not crush. Avoid sharp folds.
3. Package Contents
Please check the package contents. If any items are missing or damaged, contact customer support.
- 1 x COMFIER Cordless Knee Massager Unit
- 1 x USB Charging Cable
- 1 x Extension Strap (14.8 inches)
- 1 x User Manual
4. Product Features
- Cordless Design: Enjoy therapy without being tethered to an outlet, powered by a 2500mAh rechargeable battery.
- Graphene Heating: Provides soothing heat therapy with adjustable temperature settings (95°F - 122°F).
- Vibration Massage: Features 5 distinct massage modes (Quick Pulse, Wave, Pulse, Continuous, Rhythmic) and 3 intensity levels.
- Detachable Magnetic Touch Controller: Easy-to-use control panel that can be detached for convenience.
- 3-in-1 Versatility: Can be used on knees, shoulders, and elbows.
- Adjustable Timer: Select from 15, 30, or 45-minute automatic shut-off timers.
- Comfortable Fit: Designed to fit thighs up to 23 inches and calves up to 20 inches, with an included extension strap.
The device offers five distinct vibration massage modes and three intensity levels for customizable relief.
Beyond the knee, the versatile design allows for use on the shoulder and elbow for broader application.
The device features a detachable magnetic touch controller for easy operation and a built-in 2500mAh battery for cordless use.
5. Setup
5.1 Charging the Device
- Connect the USB charging cable to the charging port on the massager unit.
- Plug the other end of the USB cable into a compatible USB power adapter (not included) or a computer USB port.
- The battery indicator on the controller will show charging status. A full charge typically takes 2-3 hours.
- Disconnect the charger once fully charged.
5.2 Wearing the Massager
- Unfold the massager and place it around your knee, shoulder, or elbow.
- Secure the straps firmly but comfortably using the hook-and-loop fasteners. Ensure the heating and vibration elements are positioned directly over the desired area.
- If needed, use the included extension strap to achieve a comfortable fit for larger limbs.
The massager is designed to fit thighs up to 23 inches and calves up to 20 inches, and includes a 14.8-inch extension strap for a secure and comfortable fit.
6. Operating Instructions
The device is controlled via the detachable magnetic touch controller.
- Power On/Off: Press and hold the power button (O/I) for 2 seconds to turn the device on or off. The display will illuminate.
- Select Massage Mode: Press the 'Mode' button (M) to cycle through the 5 vibration massage modes: Quick Pulse, Wave, Pulse, Continuous, Rhythmic.
- Adjust Intensity: Press the 'Intensity' button (III) to adjust the vibration intensity (3 levels).
- Activate/Adjust Heat: Press the 'Heat' button (~) to turn on the heating function and cycle through the temperature levels (95°F, 104°F, 113°F, 122°F).
- Set Timer: Press the 'Timer' button (T) to select a session duration: 15, 30, or 45 minutes. The device will automatically shut off after the selected time.
For optimal results, it is recommended to use the massager for 15-30 minutes per session, up to twice a day.
The portable design allows for use in diverse situations, including post-exercise recovery, during daily chores, while working, or relaxing.
7. Maintenance
7.1 Cleaning
- Ensure the device is turned off and unplugged before cleaning.
- Wipe the surface of the massager with a soft, damp cloth. Do not use abrasive cleaners or harsh chemicals.
- Do not immerse the device in water or any other liquid.
- Allow the device to air dry completely before storing or next use.
7.2 Storage
- Store the massager in a cool, dry place, away from direct sunlight and extreme temperatures.
- Avoid placing heavy objects on top of the device.
- Keep out of reach of children and pets.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Battery is low or depleted. | Charge the device fully. |
| No heat or weak heat. | Heat function not activated or set to lowest level. | Press the 'Heat' button to activate and increase the temperature setting. Ensure the device is properly positioned. |
| No vibration or weak vibration. | Vibration function not activated or set to lowest intensity. | Press the 'Mode' button to select a mode and the 'Intensity' button to increase intensity. |
| Controller not responding. | Controller not properly attached or battery low. | Ensure the magnetic controller is securely attached. Charge the device. |
| Device shuts off unexpectedly. | Timer expired or battery depleted. | Check the timer setting. Recharge the device. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | CF-5318C1-UK |
| Brand | COMFIER |
| Material | Polyester |
| Color | Dark Black |
| Battery Capacity | 2500mAh |
| Heating Temperature Range | 95°F - 122°F (35°C - 50°C) |
| Vibration Modes | 5 (Quick Pulse, Wave, Pulse, Continuous, Rhythmic) |
| Vibration Intensities | 3 Levels |
| Timer Settings | 15, 30, 45 minutes |
| Max Thigh Circumference | 23 inches (with extension strap) |
| Max Calf Circumference | 20 inches (with extension strap) |
Key features include FSA or HSA eligibility, Graphene heating for even warmth, three adjustable timer settings (15/30/45 minutes), and a design accommodating various leg sizes.
10. Warranty and Support
COMFIER products are designed to provide reliable performance. In the unlikely event that you experience any issues, please refer to the warranty information provided with your purchase or contact COMFIER customer support for assistance.
For support, please visit the official COMFIER website or contact their customer service department directly. Please have your model number (CF-5318C1-UK) and purchase details ready.

