Round button design, one key to turn on, adjust power. Fall asleep easily every dayUSB charging is convenient, can be connected to the computer's USB port, mobile power, power supply and other charging methods, and the battery life is long.The use of this product can stimulate the neurotransmitter of the cerebral through -current to regulate emotions, thereby promoting sleep.Using this product, the hands can be properly stimulated, so that the same hand and brain frequencies can be used to relieve anxiety.Small and convenient, you can take it with you.Suitable for people with insomnia, overthinking, etc.Specification:Input voltage: DC 5V/1ABattery capacity: 500mAhWorking power: 0.5WWorking current: 1.5-2ACharging time: 1.5HProduct material: ABS+stainless steelProduct size: 25 x 32 x 70mmDescription:Effectively help you fall asleep and improve their sleep quality.Color: GreenPackage Contents:1 x Help sleep1 x USB data cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.