Round Low-Frequency Pulse Current Microampere Level, Does Not Hurt The Body'S Function, Still Helps Sleep After Discontinuing Use, Non-, No Dependence, Through The Palm Of The Hand To Pass Current, Avoiding The Risk Of Direct Stimulation Of The Brain Current. design, one key to turn on, adjust power. Fall asleep every day USB 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 Mini 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: Product name: Sleep instrument Product model: M003 input voltage: DC 5V/1A Working power: 5W Charging time: 2.5H fully Usage time: Fixed 20 minutes automatic shutdown, can be used about 40 times. Charging interface: Type-C charging NOTE: hand warmer size: 38 x 50 x 80MM Material: ABS+stainless steel colour: A-black Package Contents: 1 x Help sleep 1 x USB data cable Only 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.