USB lithium battery charging, with screen 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 time appropriately. The padlock is suitable for airport and travel use. Secure your valuable items at any time to protect your privacy. How to reset the lock: If the timer does not respond or the LCD is not displaying correctly, follow these steps: 1. Press the center of the LCD screen to remove the protective film. Locate the reset point under the screw on the left side of the screen. 2. Use a metal pin or clip and insert it into the hole to initiate reset. 3. When a "Bi" sound is heard (in sound mode), the LCD will display properly. The timer has been successfully reset. 4. Reapply the protective film after resetting. Weight: 30g Color: Black Material: ABS Package Contents: 1 x Time Lock Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3cm.