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 manually forced open. Please set the timer appropriately. The padlock combination is suitable for airport and travel security. Secure your valuable items anytime to protect your privacy. How to reset the timer lock: If the timer does not respond or the LCD screen does not display properly, follow these steps: 1. Press the center of the LCD SN to remove the protective film completely. 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 hole to initiate reset. 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 after resetting. Weight: 57g Color: White Material: ABS Package Contents: 1 x Time Lock (Other items not included) Note: Lighting effects and monitor settings may cause slight color differences between the image and actual item. Measurement error allowance is +/- 1-3 cm.