Product Description: 1. This sleep instrument uses EMS microcurrent to help you fall asleep easily and quickly, reduce stress and get better sleep quality. 2. Pure physical improvement of sleep quality, non-drugs, no chemicals added, no side effects, no dependence, no harm to the body. 3. 9 modes (sleep mode/excitement mode)and the intensity of 9gears can be adjusted to meet the needs of different people. 4. It is very suitable for people who are stressed, easily anxious and depressed, have difficulty falling asleep and easily wake up in the *Built in battery capacity: 1000mAh-1200mAh (inclusive) *Built in battery: Built in battery *Specifications: Music Sleep Device, Pulse Sleep Aid *Battery life: over 12 hours *Display mode: LED LCD display *Rated power: 0.1W *Rated voltage: 3.7V *Charging current: 0.35A *Product weight: 53g *Package include:1 x Sleep Aid Device *Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)