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 locked, the padlock remains securely closed and cannot be opened manually. Please set the time appropriately. The padlock is suitable for travel and airport use, helping 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 screen to remove the protective film. Locate the reset hole under the screw on the left side of the screen. 2. Use a metal pin or clip and insert it into the reset hole, then press gently. 3. When a "Bi" sound is heard (in sound mode), the LCD will display correctly and the timer will be reset. 4. Reattach 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 color variation between the image and the actual item. Measurement error allowed is +/- 1-3cm.