USB lithium battery charging, with SN and 3 small buttons to set hours or minutes; the 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. The padlock combination is suitable for airport and travel safety. You can lock your important items at any time to protect your privacy. How to reset the timer lock: If you find that you cannot operate the timeout or the LCD is not displayed correctly, please follow these steps: 1. Press the center of the LCD SN to strip the protective film and tear the film off. You will find a reset hole under a screw on the left side of the SN. 2. Find a metal pin or metal clip and insert it into the hole to reset the device. 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. Weight: 57g Color: White Material: ABS Package Contents: 1 x Time Lock Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.