USB rechargeable lithium battery with a digital display and three small buttons to set the timer in hours or minutes, with a maximum setting of 99 hours and 59 minutes. USB charging provides extended usage time. When the lock is engaged, it remains securely closed and cannot be opened manually. Set the timer appropriately for optimal use. This lightweight combination padlock is designed for travel safety, including airport use, allowing you to secure personal items and protect privacy. How to reset the timer lock: 1. Press the center of the LCD screen to remove the protective film. 2. Locate the reset hole under the screw on the left side of the screen. Use a metal pin or clip to insert into the hole and press the reset button inside. 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: Light and screen display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.