Feature:1. Sleep Aid Instrument: It can help people with insufficient sleep, migraine, anxiety, or stress to fall asleep as soon as possible, small body but powerful, easier to enter deep sleep every day.2. Working Principle: Uses microcurrent to stimulate neurotransmitters in the cerebral cortex to regulate mood, calm down mind to relax the body, and thus promote sleep.3. 2 Operating Modes: Low frequency relaxation mode (to improve insomnia) and high frequency exciting mode (to concentrate), just press the power button to adjust the mode, press +/- to increase or decrease the strength.4. Compact and Portable: Lightweight and portable, with silicone anti drop strap, easy to put the wrist. It can be used in the office, at home and on business trips.5. Uses: Use it during the day to focus more on important things and complete your work effectively. Suitable for yourself, your family, friends and colleagues.Specification:Specifications:Input Voltage: DC 5V/1AWorking Power: 0.5WBattery Capacity: 500mAhUsage Time: Fixed 20 minutes automatic shutdown, can be used for about 50 timesCharging Time: 1.5HCharging Interface: MicroUSBMaterial: ABS+Stainless steelColor: GrayItem Size: 70*32*25mm/2.75*1.26*0.98inItem Weight: 44g/1.55ozPackage Size: 120*78*58mm/4.72*3.07*2.28inPackage Weight: 144g/5.08oz.Package List:1 * Sleep Aid Device1 * USB Cable1 * User Manual