USB charging with lithium battery, with screen and 3 small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes. USB charging lasts 120 hours. Once the lock is locked, it will not open, and it is impossible to open by hand. Please set the time reasonably. 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. How do I reset the time lock? If you find that you cannot operate the timeout or the LCD is not displaying properly. please try the following to set the timer: 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 needle or metal clip and insert it into the hole and run it then. 3: When you hear a \"Bi \" sound (in sound mode), the LCD will display correctly. The timeout has been reset. 4: Glue the protective film back on. weight 30g. colour: black Material: ABS Package Contents: 1 * Time lock Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.