USB charging lasts for 120 hours.When the lock is locked, it will not open and it is impossible to break it by hand. Please set the time reasonably.USB lithium battery charging, with screen and 3 small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes.The padlock combination is lightweight and suitable for airport and travel safety. You can lock your important items at any time to protect your privacy.1:Press the center of the LCD screen to strip the protective film and tear the film off. 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 to the end and then run it.3:When you hear a "Bi" sound (in sound mode), the LCD will display correctly. The timeout has been successfully reset.4:Please glue the protective film back on.