USB lithium battery charging with screen 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 the lock is engaged, it remains securely closed and cannot be opened manually. Set the timer appropriately for optimal use. This lightweight padlock is suitable for travel and airport security, allowing you to secure valuables and protect personal privacy. How to reset the timer lock: 1. Press the center of the LCD screen to remove the protective film. Locate the reset button under the screw on the left side of the screen. 2. Use a metal pin or clip to insert into the hole and press the reset button. 3. When a "Beep" sound is heard (in sound mode), the LCD will display correctly, indicating the timer has been reset. 4. Reapply the protective film after resetting. Weight: 30g Color: Black Material: ABS Package Contents: 1 x Time Lock Note: Lighting and monitor settings may cause slight color variations between the image and actual item. Measurement tolerance is +/- 1-3 cm.