The sleeping instrument is small and portable, can hold it in hand, solve sleep problems easily by microcurrent stimulation. Features: Mini sleeping instrument, hold it in hand to make you sleep easily. Small and lightweight, easy to take, matte texture for comfortable hand feel. Stimulates neurotransmitters in the cerebral cortex through micro-currents to regulate mood and promote sleep. Physical harmonyr, without side effects, not harmful, not addictive. Easily adjust the frequency by rotation, easy sleep every day. USB rechargeable, convenient energy supply method, long cell life. Suitable for people of stress, anxiety, depression, sleeplessness, abnormal life and rest. Specifications: Material: ABS + Stainless steel Color: Orange, White, Blue (optional) Cell Capacity: 500mAh Input Voltage: 5V/1A Working Watt: 0.5W Energy Time: 1.5H Usage Time: Fixed 20 minutes automatic shutdown, can be used for about 40 times Item Size: 68.5 * 40.5 * 38.5mm / 2.7 * 1.59 * 1.52in Item Weight: 42g / 1.48ounces Package Weight: 133g / 4.69ounces Package Size: 100 * 70 * 68.5mm / 3.94 * 2.76 * 2.7in Recommendations for use: For people with anxiety and depression, it is recommended to use it once in the morning, at noon and at night, and once for 20 minutes. For people with insomnia, it is recommended to use it once before going to bed, once for 20 minutes. Packing List: 1 * Sleeping Instrument 1 * USB Cable 1 * User Manual