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 up to 120 hours. When locked, the lock cannot be opened manually and is resistant to forced entry. Please set the time appropriately. The padlock combination is suitable for airport and travel security. You can secure your important items at any time to protect your privacy. How to reset the timer lock: If you are unable to operate the timeout function or the LCD does not display correctly, please follow these steps: 1. Press the center of the LCD SN to remove the protective film. Locate the reset button under a screw on the left side of the SN. 2. Use a metal pin or clip and insert it into the hole to activate the reset. 3. When you hear a "beep" sound (in sound mode), the LCD will display properly. The timer has been successfully reset. 4. Reapply the protective film after resetting. Weight: 57g Color: White Material: ABS Package Contents: 1 x Time Lock Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.