1. Introduction
This user manual provides essential information for the safe and effective use of your saschedross 8.4V AC/DC Adapter. This adapter is designed to provide power and charge 7.4V lithium-ion batteries found in various electric massager guns, including models like Fascial Gun GB-820, KH-320, BinNiao, and HULKBUZZ. Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
To ensure safe operation and prevent damage, observe the following safety precautions:
- Input Voltage: Ensure the power outlet voltage is within the adapter's specified input range of 100-240VAC, 50/60Hz.
- Compatibility: Use this adapter only with devices that require an 8.4V DC input and a 1A current draw, specifically 7.4V lithium-ion battery massager guns. Using it with incompatible devices may cause damage or fire.
- Protection Features: The adapter is equipped with Over Voltage Protection (OVP), Over Current Protection (OCP), and Short Circuit Protection (SCP) to safeguard your devices. However, avoid intentional short circuits or overloading.
- Environment: Do not expose the adapter to water, moisture, high temperatures, or direct sunlight. Use in a well-ventilated area.
- Handling: Do not drop, disassemble, or attempt to repair the adapter. If damaged, discontinue use and contact support.
- Children: Keep the adapter out of reach of children.
3. Product Overview
The saschedross 8.4V AC/DC Adapter is a compact and reliable power supply designed for charging compatible massage guns. It features a standard US plug and a barrel connector for device attachment.

Image 3.1: Adapter dimensions. The adapter measures approximately 2.7 inches in length and 1.2 inches in width, making it compact for travel and storage.

Image 3.2: Adapter with cable. The adapter features a durable power cord measuring 6.5 feet (approximately 2 meters) in length, providing ample reach for charging.
4. Setup
Follow these steps to set up your AC/DC adapter:
- Inspect: Before first use, visually inspect the adapter and cable for any signs of damage. Do not use if damaged.
- Connect to Device: Insert the barrel connector end of the adapter cable into the charging port of your compatible massage gun. Ensure a snug fit.
- Connect to Power: Plug the AC prongs of the adapter into a standard wall power outlet (100-240VAC, 50/60Hz).
- Verify: Confirm that the charging indicator on your massage gun (if present) illuminates, indicating that charging has begun.
5. Operating Instructions
The adapter operates automatically once connected. Its primary function is to supply power and charge the battery of your compatible massage gun.
- Charging: Once connected to both the device and a power outlet, the adapter will begin charging the device's battery. The charging status is typically indicated by an LED light on the massage gun itself.
- Full Charge: Refer to your massage gun's manual for information on when its battery is fully charged. Disconnect the adapter once charging is complete to conserve energy.
- Continuous Power: The adapter can also provide continuous power to your massage gun if it is designed to operate while plugged in, though this is less common for battery-powered devices.
6. Maintenance
Proper maintenance ensures the longevity and safe operation of your adapter.
- Cleaning: Disconnect the adapter from the power outlet and the device before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or solvents.
- Storage: Store the adapter in a cool, dry place away from direct sunlight and moisture when not in use. Avoid wrapping the cable too tightly around the adapter to prevent damage to the wire.
- Inspection: Periodically check the cable and connectors for any signs of wear, cuts, or bends. If damage is observed, replace the adapter.
7. Troubleshooting
If you encounter issues with your adapter, try the following solutions:
- No Power/Charging:
- Ensure the adapter is securely plugged into a working wall outlet.
- Verify the barrel connector is fully inserted into the device's charging port.
- Test the wall outlet with another device to confirm it has power.
- Check the adapter cable for any visible damage.
- Slow Charging:
- Ensure the device is not in active use while charging.
- Confirm the adapter specifications (8.4V, 1A) match the requirements of your massage gun.
- Adapter Overheating:
- Disconnect the adapter immediately.
- Ensure the adapter is used in a well-ventilated area, not covered by blankets or other materials.
- If overheating persists, discontinue use and contact customer support.
If these steps do not resolve the issue, please contact customer support for further assistance.
8. Specifications
| Input Voltage | 100-240VAC, 50/60Hz |
| Output Voltage | 8.4V DC |
| Output Current | 1A (1000mA) |
| Power Output | 8.4W |
| Connector Type | Barrel Connector |
| Cable Length | 6.5 ft (approx. 2 meters) |
| Protection Features | OVP (Over Voltage Protection), OCP (Over Current Protection), SCP (Short Circuit Protection) |
| Certifications | CE |
| Compatible Devices | Fascial Gun GB-820, KH-320, BinNiao, HULKBUZZ 7.4V Lithium Ion Massage Guns |
9. Warranty and Support
This product is manufactured by Shenzhen Waweis Technology Co., Ltd. For warranty information or technical support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your proof of purchase for any warranty claims.





