Introduction
The OSITO Health Expert Electronic Stimulator, Model AST-300J, is designed to provide muscle stimulation and pain relief using both Electrical Muscle Stimulation (EMS) and Transcutaneous Electrical Nerve Stimulation (TENS) technologies. This device aims to improve muscle performance and temporarily relieve pain associated with sore and aching muscles in various body parts, including the shoulder, waist, back, neck, arm, leg, and foot.
This manual provides essential information for the safe and effective use of your electronic stimulator. Please read it thoroughly before operation and retain it for future reference.

Image: The OSITO Health Expert Electronic Stimulator device.
Safety Information
Important: Always read and follow the instructions provided with the device. Failure to do so may result in injury or device malfunction.
- Do not use if you have a pacemaker or other electronic medical device.
- Keep the device and its components dry to prevent electrical shock.
- If you receive the product with any missing parts or shipping damage, contact customer service immediately.
- Do not use the device if the cord is damaged or frayed.
- Consult with a healthcare professional before use if you have any medical conditions or are pregnant.
Product Components
The OSITO Health Expert Electronic Stimulator system includes the main unit, electrode pads, and a remote control. Familiarize yourself with these components before use.

Image: The portable design of the OSITO Electronic Stimulator.

Image: Detailed view of the control panel and digital display.

Image: Self-adhesive electrode pads with 2mm pin connector for body application.
Setup
Follow these steps to set up your OSITO Electronic Stimulator for use:
- Connect Power: Plug the adapter into a power outlet and connect the cord to the massager machine.
- Power On: Long press the "ON/OFF" button for 3 seconds to turn on the device. You can then choose to use the remote control or manual settings.
- Optional Electrode Pads: If using electrode pads for body stimulation, connect the cable to the electrode patch and then connect the patch to the foot massager unit. Attach the electrode patch to the desired body area.

Image: Visual guide for connecting power, turning on, and attaching electrode pads.
Operating Instructions
The device offers various modes and intensity levels for both foot and body stimulation. It can be operated using the control panel on the device or the included remote control.
Modes of Operation:
- PMS (Mode 1~8): Intended to stimulate healthy muscles to improve and facilitate muscle performance.
- TENS (Mode 9~25): Used for temporary relief of pain associated with sore and aching muscles due to strain from exercise or normal household work activities by applying current to stimulate nerves.
Adjusting Settings:
- Select Mode: Press the "Mode +" or "Mode -" buttons to cycle through the available 25 modes.
- Adjust Foot Intensity: For foot stimulation, press "Sole +" or "Sole -" to select the desired intensity level (99 adjustable levels).
- Adjust Body Intensity: If using electrode pads, press "Body +" or "Body -" to select the intensity for body stimulation.
- Set Time: Press "Time +" or "Time -" to set the duration of your session.
Note: Do not use this product with socks on when using the foot pads, as this may interfere with proper conductivity.

Image: The OSITO Electronic Stimulator can be operated conveniently with its remote control.
Video: This video demonstrates the basic operation and effects of the EMS Foot Massager, showing how it stimulates leg muscles and can be used with electrode pads on other body parts.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your device.
- Cleaning: Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or immerse the device in water.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures. Keep it out of reach of children.
- Electrode Pads: Replace electrode pads when they lose their stickiness or conductivity. Ensure they are stored properly to maintain their adhesive quality.
Troubleshooting
If you encounter issues with your OSITO Electronic Stimulator, refer to the following common solutions:
- Device Not Powering On:
- Ensure the power adapter is securely plugged into both the device and a working electrical outlet.
- Check if the power cord is damaged or frayed. If so, discontinue use and contact support.
- No Sensation During Use:
- Increase the intensity level using the "Sole +" or "Body +" buttons.
- Ensure your bare feet are in full contact with the foot pads, or that electrode pads are firmly attached to clean, dry skin.
- Check if the electrode pads need replacement due to loss of stickiness.
- Remote Control Not Working:
- Ensure there are no obstructions between the remote and the device.
- Check and replace the remote control batteries if necessary.
If the problem persists after attempting these solutions, please contact customer support.
Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 14.6 x 14.6 x 4.5 inches |
| Weight | 3.8 pounds |
| Model Number (Manufacturer Part Number) | AST-400 |
| Item Model Number (UPC) | 755752343416 |
| Manufacturer | OSITO |
| Power Source | Corded Electric |
| Special Features | Heat, Rechargeable, Speed Control |
| Massager Form | Foot Massager Machine |
| Water Resistance Level | Not Water Resistant |
| Massage Therapy Technique | Compression |
| Material Type | Silicone |
| Color | White |
Warranty and Support
Specific warranty details are not provided in the product information. For warranty claims, technical support, or any inquiries regarding your OSITO Health Expert Electronic Stimulator, please contact the manufacturer directly through their official website or the contact information provided with your purchase documentation.