Features: 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. 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. 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 intensity. Compact & Portable: Lightweight and portable, with silicone anti-drop strap, easy to hang from the wrist. It can be used in the office, at home and on business trips. Best Gift: Use it during the day to focus more on important things and complete your work effectively; use it at night to relieve anxiety and stress, improve insomnia. This is the best gift for yourself, your family, friends and colleagues. 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, Orange, Blue (Optional) 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 * Charging Cable 1 * User Manual (English/Chinese) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store