USB lithium battery charging with SN and three small buttons to set hours or minutes; maximum setting time is 99 hours and 59 minutes. USB charging provides up to 120 hours of operation. When locked, the device remains securely closed and cannot be opened manually. Please set the timer appropriately. The padlock design is suitable for travel and airport security. It allows users to secure personal items and protect privacy. How to reset the timer lock: If the timer does not operate correctly or the LCD does not display properly, follow these steps: 1. Press the center of the LCD SN to remove the protective film. Locate the reset hole under the screw on the left side of the SN. 2. Use a metal pin or clip and insert it into the reset hole. 3. When a "Bi" sound is heard (in sound mode), the LCD will display correctly, indicating the timer has been reset successfully. 4. Reattach 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 +/- 1-3cm.