Description: Helps those people who is insufficient sleep and poor psychological quality to fall asleep as soon as possible. Also, it has the functions of relieving migraine, relieving anxiety and regulating and calming emotions. Protective shell, lanyard design, lightweight and portable, simple operation, small size, USB charging speed, easy to use. Can be used in the office, home and business trips, 15 minutes a day can moderately relieve headaches, helps you focus on important matters and complete your work more effectively. New matte texture, in line with the design of hand grip, round button design, one key to turn on, adjust power. A great gift for families and friends who has sleeping problem. Specification: Materials: ABS and Stainless Steel Battery Capacity: 500mAh Input Voltage: DC 5V/1A Working Power: 0.5W Charging Time: 1.5H full charge Usage time: It will automatically shut down for a fixed period of 20 minutes, and it can be used about 50 times Charging Interface: Micro USB Size Chart: Size: Approx. 25x32x70mm/0.98x1.25x2.75inch Package Includes: 1 Piece Sleep Aid Instrument 1 Piece Silicone Lanyard 1 Piece USB Cable 1 Piece Manual Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!