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/1A Working Power: 0.5W Battery Capacity: 500mAh Usage Time: Fixed 20 minutes automatic shutdown, can be used for about 50 times Charging Time: 1.5H Charging Interface: MicroUSB Material: ABS+Stainless steel Color: Gray Item Size: 70*32*25mm/2.75*1.26*0.98in Item Weight: 44g/1.55oz Package Size: 120*78*58mm/4.72*3.07*2.28in Package Weight: 144g/5.08oz . Package List: 1 * Sleep Aid Device 1 * USB Cable 1 * User Manual