USB charging with lithium battery, with 3 small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes. USB charging lasts for 120 hours. Once the lock is locked, it will not open and it is impossible to break it open by hand. Please set the time reasonably. The padlock combination is lightweight and suitable for airport and travel security. You can lock your important items at any time to protect your privacy. Model number: Smart Time Lock Weight 60g Function 1: LCD Time Lock Function 2: USB Rechargeable Temporary Timer Padlock If you find that you cannot use the timeout or the LCD screen does not display correctly. Follow this way to set the timer: 1: Press the middle 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 .2: Find a metal needle or metal clip and insert it into the hole to the end, then drive it.3: When you hear a \"Bi \" sound (in sound mode), the LCD screen will display correctly. The timeout has been reset.4: Glue back the protective film. Colour: Black Material: ABS Size: 7.3 x 4.7 x 2 cm Package contents: 2 x 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 allowed measurement error is +/- 1-3 cm.