Features: Round button design, one button to turn-on, adjust the power-supply. Fall asleep easily every day. USB is convenient for charging, it can be connected to the computer USB port, mobile power, power-supply and other charging methods, and the battery life is long. Using this product, the hand is properly stimulated, so that the-feeling of anxiety can be-calmed by the same frequency of the hand and brain. Small and convenient, you can carry it with-you. Pure physical improvement of sleep quality, non-drugs, no chemicals added, no side-effects, no-dependence, no harm to the body. This sleep instrument uses-EMS micro-current to help you fall asleep easily and quickly, reduce stress and get-better sleep quality. It is very suitable for people who are stressed, easily anxious and depressed, have difficulty falling asleep and easily-wake up in the middle of the night. Specifications: Material:ABS+ Stainless Steel Size:Approx.5.5x4.1x2.7cm/2.16x1.61x1.06inch Model: QBQ-01 Voltage-input: DC5V0.5A Power: 0.5W Battery capacity: 300mAh Charging time: 1.5hours Micro-current usage times: about 60times (fully-charged) Product weight: 29 grams Color:White Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Sleeping-Instrument