1. Introduction
The Xpudding ST-304A Neck Massager is designed to provide temporary relief from pain associated with sore and aching muscles in the back of the neck. It utilizes Transcutaneous Electrical Nerve Stimulation (TENS) technology combined with a heating function to help relax muscles and alleviate discomfort. This device is portable, wireless, and features multiple modes and intensity levels for a customizable experience.
Package Contents:
- Xpudding ST-304A Neck Massager Unit
- Wireless Remote Control
- USB Charging Cable
- User Manual
2. Safety Information
WARNING: Please read all safety instructions carefully before use to prevent injury or damage to the device.
- Do not use if you have a pacemaker, implanted defibrillator, or other metallic or electronic implants.
- Do not use if you are pregnant.
- Do not use on broken, damaged, or irritated skin.
- Do not use while sleeping or driving.
- Avoid using on wet skin.
- Keep out of reach of children.
- Consult a physician before use if you have any medical conditions or concerns.
- The device provides gentle warmth, not intense heat. Heat sensation may vary and can take up to 10 minutes to reach maximum temperature.
3. Product Overview
The Xpudding ST-304A Neck Massager is designed for ergonomic comfort and ease of use. It features a flexible design to fit various neck sizes and includes both on-device controls and a magnetic remote control.

Image: The Xpudding ST-304A Neck Massager unit, its remote control, and the USB charging cable.
Components and Controls:
- Massager Unit: Features two electrode pads for TENS stimulation and heat application. Includes power, mode, and intensity buttons on the side.
- Remote Control: Allows convenient adjustment of modes, intensity, and heat function. It magnetically attaches to the massager unit for storage.
- USB Charging Port: Located on the massager unit for recharging the internal battery.

Image: Detailed diagram illustrating the power, heat, mode, and intensity buttons on both the massager unit and the remote control.
4. Setup
Initial Charging:
- Before first use, fully charge the neck massager for approximately 60 minutes using the provided USB cable.
- Connect the USB cable to the charging port on the massager unit and a suitable USB power source (e.g., computer, wall adapter).
- The indicator light will show charging status (refer to the device's specific light indicators for full charge).
- Ensure the device is turned off during charging to protect the battery.
Wearing the Device:
The massager is designed to be flexible. Gently adjust the arms of the massager to fit comfortably around your neck, ensuring the electrode pads make good contact with your skin.

Image: The neck massager being worn, demonstrating proper placement for effective use.
5. Operating Instructions
Power On/Off:
- On Device: Press and hold the power button on the massager unit for a few seconds to turn it on or off.
- Remote Control: Use the dedicated power button on the remote control to turn the device on or off.
Adjusting Modes and Intensity:
The massager offers 3 modes and 15 output intensity levels. The stimulation function and heating function can be used separately or simultaneously.

Image: Visual representation of the various massage modes and intensity levels available on the device.
- Changing Modes: Short press the 'M' button on the remote or the mode button on the device to cycle through the available massage modes.
- Adjusting Intensity: Use the '+' and '-' buttons on the remote or device to increase or decrease the intensity level. Start with a low intensity and gradually increase to a comfortable level.
Heat Function:
The heating function provides a constant temperature of 32°C to 38°C (90°F–100°F). It offers gentle warmth, not intense heat, and may take 3 to 10 minutes to reach its maximum temperature of 118.4°F.
- Activating Heat: Press the heat button (indicated by a wavy lines icon) on the remote or device to turn on the heating function.
- Deactivating Heat: Press the heat button again to turn off the heating function.
Battery Life:
A full charge provides approximately 200 minutes of use with the heating function active, and up to 360 minutes without the heating function.
6. Maintenance
Cleaning:
- Ensure the device is turned off and unplugged before cleaning.
- Wipe the massager unit and electrode pads with a soft, slightly damp cloth.
- Do not use abrasive cleaners, alcohol, or harsh chemicals.
- Do not immerse the device in water or any other liquid.
Storage:
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Keep the remote control attached magnetically to the massager unit to prevent loss.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Low battery or not activated. | Charge the device for 60 minutes. Ensure the device is turned off during charging. |
| No sensation or weak sensation during TENS massage. | Poor contact with skin, low intensity, or dry skin. | Ensure electrode pads are making firm contact with the skin. Increase intensity gradually. Apply a small amount of water or conductive gel to the skin if necessary. |
| Remote control is unresponsive. | Remote battery is low or depleted. | Replace the CR2032 battery in the remote control. |
| Heat function is not noticeable. | Insufficient time for heating or individual perception. | Allow 3-10 minutes for the heat to reach its maximum temperature. Heat sensation can vary between individuals. |
8. Specifications
- Model Number: ST-304A
- Product Dimensions: 5 x 5 x 8 inches
- Item Weight: 7.05 ounces (200 Grams)
- Power Source: Battery Powered (1200 mAh rechargeable photosensitive battery)
- Charging Time: Approximately 60 minutes for full charge
- Battery Life: 200 minutes (with heating), 360 minutes (without heating)
- Massage Modes: 3 modes
- Intensity Levels: 15 output intensity levels
- Heat Temperature: Constant 32°C to 38°C (90°F–100°F), maximum 118.4°F
- Special Features: Cordless, Heat, Portable, Remote Control
- Material Type: Plastic
- Manufacturer: Shenzhen Future Electronic Co.,Ltd
9. Warranty and Support
The Xpudding ST-304A Neck Massager comes with a 180-day manufacturer's warranty. For any issues regarding this product, please contact the manufacturer or seller for a satisfactory solution.
For further assistance or inquiries, please refer to the contact information provided with your purchase documentation or visit the official Xpudding support website.
10. Product Video
Video: An overview of the F9 Neck Massager, demonstrating its features and usage. This video is provided by the seller, XiaobudingUS.