USB charging lasts 120 hours. When the lock is locked, it does not open and it is impossible to break it by hand. Please set the time reasonably. USB lithium battery charging, with display and 3 small buttons to adjust hours or minutes, the maximum adjustmenttime is 99 hours and 59 minutes. The padlock combination is lightweight and suitable for airport and travel security. You can lock your important things at any time to protect your privacy. 1:Press the center of the LCD screen to remove the protective film and tear off the film. You will find a stop under a screw on the left side of the screen. 2: Find a metal pin or metal clip and insert it into the hole until the end, then run it. 3: When you hear a Bi sound (in sound mode), the LCD screen is displayed correctly. Timeout has been successfully reset. 4:Please re-stick the protective film. Delivery quantity: 1 piece,