re: 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. 4. It can stimulate neurotransmitters in the cerebral cortex through microcurrents, regulate emotions, and promote sleep. 5. When using this product, properly stimulate the hands, so that the hands and brain will be at the same frequency to calm the anxiety. 6. Light weight and in small size, easy to carry when going out. Suitable for patients with insomnia and anxiety. Specification: Condition: 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 How to Use: Press the power button is the low-frequency decompression mode, which is recommended for left hand. Pressing the power button again is the high-frequency encouragement mode, which is recommended for the right hand. Adjust power with +/- keys on both sides Long press the power button to shut down.   Package List: 1 x Host 1 x Manual 1 x USB Cable   Note: 1. It is forbidden to use with implanted medical appliances, such as pacemakers, which