1. Introduction
Thank you for choosing the OTO Sole Mate SM-400 Back and Foot Massager. This device is designed to provide targeted massage and relaxation for both your back and feet. Featuring 8 massage nodes, dual-direction rotation, and an optional soothing heat function, the SM-400 offers a versatile and comfortable massage experience. Please read this manual thoroughly before use to ensure safe and optimal operation.
2. Important Safety Instructions
WARNING: To reduce the risk of burns, fire, electric shock, or injury to persons:
- Always unplug the appliance from the electrical outlet immediately after using and before cleaning.
- Do not use while bathing or in a shower.
- Do not place or store appliance where it can fall or be pulled into a tub or sink.
- Do not place in or drop into water or other liquid.
- 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. Return the appliance to a service center for examination and repair.
- 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 sensitive skin areas or where circulation is poor.
- Prolonged use of massage may lead to overheating and shorten the product life. If this occurs, discontinue use and allow the unit to cool before operating.
- Consult your doctor before using this product if you are pregnant, have a pacemaker, or have any concerns regarding your health.
3. Product Overview
The OTO Sole Mate SM-400 features an ergonomic design with multiple massage nodes and a simple control interface. It is designed to contour to the shape of your back and feet for maximum comfort.
Figure 1: Top view of the OTO Sole Mate SM-400, showing the massage surfaces and power button.
Key Components:
- Massage Surfaces: Two contoured areas with 8 massage nodes each, totaling 18 powerful rotating massage heads.
- Power/Mode Button: A single button to control power, massage modes, and heat function.
- Power Cord: For connecting to an electrical outlet.
- Height Adjustment Feet: Located on the underside for optimal positioning during use.
- Cable Storage Slot: For neat storage of the power cord.
4. Setup
- Unpack: Carefully remove the OTO Sole Mate SM-400 from its packaging.
- Placement: Place the massager on a flat, stable surface. Ensure there is enough space around the device for comfortable use.
- Power Connection: Insert the power cord into a standard electrical outlet. Ensure the voltage matches the specifications listed on the device.
- Cord Management: Utilize the integrated cable storage slot to keep the power cord tidy when not in use.
5. Operating Instructions
The OTO Sole Mate SM-400 is operated using a single 1-touch button. Each press cycles through different massage modes and functions.
- Power On: Press the power button once to turn on the massager. The default mode typically starts with a kneading massage.
- Change Massage Mode/Speed: Subsequent presses of the power button will cycle through the 4 available massage modes and 2 levels of massage speeds. The device features deep kneading massage with dual-direction rotation.
- Activate Heat Function: The soothing heat therapy function is integrated into the massage modes. It will activate automatically with certain modes or can be toggled on/off with a specific press sequence (refer to the device's indicator lights for confirmation).
- Power Off: Continue pressing the power button until the device turns off. Always unplug the massager from the outlet after use.
Note: The device is designed for maximum comfort and features an ergonomic contour for both back and feet. Experiment with different modes to find your preferred setting.
6. Recommended Usage Positions
The OTO Sole Mate SM-400 is versatile and can be used for various body parts. Adjust the device's position and your body posture for optimal results.
6.1. Foot Massage
Place your bare feet directly onto the massage surfaces. The contoured design is ideal for targeting the soles of your feet.
Figure 2: The OTO Sole Mate SM-400 positioned for a foot massage, with feet resting on the massage nodes.
6.2. Back Massage
Position the massager against your lower or upper back while seated on a chair or sofa. The ergonomic shape allows it to conform to your back's natural curve.
Figure 3: The OTO Sole Mate SM-400 placed behind a person's back for a relaxing back massage.
6.3. Calf Massage
For calf massage, place the massager on the floor and rest your calves on the massage surfaces. You can also elevate your legs slightly for a more comfortable position.
Figure 4: The OTO Sole Mate SM-400 used to massage the calves, with the user's legs resting on the device.
Height Adjustment: The device includes height adjustment features for the feet, allowing you to optimize the angle and intensity of the massage for different body parts.
7. Maintenance and Care
Proper maintenance ensures the longevity and optimal performance of your OTO Sole Mate SM-400.
- Cleaning: Always unplug the massager before cleaning. Wipe the surface with a soft, slightly damp cloth. Do not use abrasive cleaners, solvents, or harsh chemicals.
- Do Not Immerse: Never immerse the massager in water or any other liquid.
- Storage: When not in use, store the massager in a cool, dry place, away from direct sunlight and extreme temperatures. Use the cable storage slot to keep the power cord neatly organized.
- Avoid Sharp Objects: Keep sharp objects away from the massager's surface to prevent damage.
8. Troubleshooting
If you encounter any issues with your OTO Sole Mate SM-400, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Massager does not turn on. | Power cord not properly connected. No power from outlet. | Ensure the power cord is securely plugged into both the massager and a working electrical outlet. Test the outlet with another device. |
| Massage intensity feels weak. | Incorrect mode selected. Overheating protection activated. | Cycle through the massage modes to select a higher intensity setting. If the unit feels warm, unplug it and let it cool down for 30 minutes before resuming use. |
| Heat function is not working. | Heat function not activated or device not warmed up yet. | Ensure the heat function is enabled (it may be part of a specific massage mode). Allow a few minutes for the heating elements to warm up. |
| Unusual noise during operation. | Foreign object obstruction. Internal component issue. | Turn off and unplug the device. Check for any visible obstructions. If the noise persists, discontinue use and contact customer support. |
If the problem persists after attempting these solutions, please contact OTO customer support for assistance.
9. Specifications
| Model Number | SM-400 |
| Brand | OTO |
| Dimensions (L x W x H) | 38.2L x 11.5W x 32.9H centimetres |
| Power Source | Corded Electric |
| Material | Plastic, Rubber |
| Special Features | Heat Function, Dual-Direction Rotation, 4 Massage Modes, 2 Speed Levels, Height Adjustment |
| Use For | Back, Feet, Legs (Calves) |
| Product Benefits | Stress Relief, Pain Relief, Muscle Therapy, Tissue Therapy |
10. Warranty and Customer Support
For warranty information, service, or technical support, please refer to the warranty card included with your product or visit the official OTO website. Keep your purchase receipt as proof of purchase.
Contact Information: Please refer to the contact details provided in your product packaging or on the official OTO website for customer service inquiries.





