Plug Type : EU Plug Standard Voltage : 220V Application : Hand Feature 1 : massager electric Feature 2 : microcurrent sleep aid device hand holding Feature 3 : microcurrent sleep holding sleep aid Feature 4 : microcurrent sleep helper Feature 5 : sleep device insomnia Feature 6 : sleep aid device Power Supply : USB Rechargeable Features: 1. Using electric wave therapy, stimulate the cerebral cortex through micro-current, regulate emotions, help you easily and quickly fall asleep, and get better quality sleep. 2. Pure physical sleep aid technology, no chemical substances and no side effects, and regular use will not cause adverse effects on the body. 3. The appearance is exquisite, the shape is mini, and the ergonomic design is suitable for holding it for a long time without getting tired. 4. Adjust the gear with one key, 12 gears can be adjusted, you can freely choose the mode that makes you feel most comfortable. 5. It is very suitable for people who are under high pressure in life, are prone to anxiety and depression, have difficulty falling asleep, are easily awakened in the middle of the night, and need jet lag.