USB lithium battery charging with 3 small buttons to set hours or minutes, maximum setting time is 99 hours and 59 minutes. USB charging lasts for 120 hours. When the lock is locked, it will not open and cannot be broken by hand; please set the time reasonably. Suitable for airport and travel safety, you can lock your important items at any time to protect privacy. How to reset the timer lock: If you cannot operate the timeout or the LCD is not displayed correctly, please follow these steps: 1. Press the center of the LCD screen to strip the protective film and tear it 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 run it. 3. When you hear a "Bi" sound (in sound mode), the LCD will display correctly and the timeout has been successfully reset. 4. Please glue the protective film back on. Weight: 57g Color as shown Material: ABS Package Contents: 1 x Time Lock Note: Light reflection 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.