This combination padlock is lightweight and perfect for airport and travel security. It's 4-degree waterproof and lasts for 500 hours after charging. Once locked, it cannot be opened or broken by hand. Set the time reasonably. USB rechargeable, with a screen and 3 small buttons to set hours or minutes. The maximum setting time is 99 hours and 59 minutes. Withstands 130 kg of pulling force horizontally or vertically, and is 3-degree drop resistant. Specification: Metal: Metal Color: Black / White Size: as shown Package includes: 1 pc Smart Time Lock How to reset the timer lock? : If you find that you cannot use the timeout or the LCD screen does not display correctly, please follow these steps to reset 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 screen. : 2: Find a metal pin or metal clip and insert it into the hole to the end and run it. :3: When you hear a "Beep" sound (in sound mode), the LCD screen will display correctly. The timeout has been reset. :4: Please glue the protective film back.