Feature: 1. Simple oval design, new matte texture, in line with human hand grip design, simple and comfortable. 2. Round button design, one key to turn on, adjust power. Easy to fall asleep every day. 3. USB convenient charging, can be connected to a computer USB port, power bank, power supply, etc., long endurance. Specification: Condition: 100% Brand New Item Type: Holding Sleep Instrument Material: ABS Mode: Sleep Aid / Inspiration Power Supply Mode: USB Charging Battery Capacity: 500mAh Input Voltage: DC 5V/1A Working Power: 0.5w Endurance Time: 20 Hours Suggested Use Time: 15 Minutes Package List: 1 x Host 1 x Manual 1 x USB Cable Note: We do not recommend the following people to use this product:1.Patients who use implanted electronic devices (such as pacemakers, insulin pumps) should be prohibited from using it;2. It is forbidden to use it with highfrequency surgical equipment, shortwave or microwave treatment equipment at the same time;3. It is forbidden to use treatment electrodes near the chest or use it when operating complex and dangerous equipment or driving;4. It is prohibited for patients with epilepsy;5. Patients with hemorrhagic stroke in the near future should not use it. For the sake of patient safety, we recommend not to use sleep devices in the following situations:1. When driving;2. When operating complex dangerous mechanical instruments.3. Avoid longterm strong current stimulating the same position;4. If you find that the skin is burned, you can rest for a few minutes in future use, and move the electrode position slightly before continuing treatment;5. If you find that the electrode burns the skin severely, you should stop using it in time, and use it after treatment and rehabilitation by a specialist.