describe Power source: USB, rechargeable Display mode: digital Control method: mechanical Color: black, white, pink feature 1. Watch-style sleep aid - deep sleep speed up - the secret to falling asleep quickly at night/ 2. Healthy sleep aid black technology, increase sleep time, improve sleep quality/ 3. Single physical effect/no dependence/falling asleep in 10 minutes/safe to use/high quality sleep/portable and portable/ 4. Energy at any time - put the product on your hand / let the major neural pathways relax how to use Put the product in your hand and adjust the gear time 1. The power button on the side, press and hold for 1S to turn on, and the EMS light is on 2. Press the mode button to select the mode: mild, standard and strong are optional 3. Press the time button to select the timing time: 10m/20m/30m 4. It will automatically shut down when it reaches a fixed time, or you can press and hold the power button to shut down Package Included 1 * watch 1 * Type-C charging cable 1 * manual