USB lithium battery charging, with SN and 3 small buttons to set hours or minutes; maximum setting time is 99 hours and 59 minutes. USB charging lasts up to 120 hours. When the lock is engaged, it remains securely closed and cannot be opened manually. Please set the timer appropriately. The padlock combination is suitable for airport and travel security. Lock your important items anytime to protect your privacy. How to reset the timer lock: If the timer does not operate properly or the LCD display is not functioning correctly, follow these steps: 1. Press the center of the LCD SN to remove the protective film. Locate the reset hole under a screw on the left side of the SN. 2. Use a metal pin or clip and insert it into the reset hole, then press gently. 3. When you hear a "beep" sound (in sound mode), the LCD will display correctly. The timer has been successfully reset. 4. Reapply the protective film. Weight: 57g Color: White Material: ABS Package Contents: 1 x Time Lock Only the above package content; other products are not included. Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3cm.