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 supports up to 120 hours of operation. When locked, the padlock remains securely closed and cannot be opened manually. Set the time appropriately for optimal use. The combination padlock is lightweight and suitable for airport and travel security. Secure your valuables anytime to protect privacy. How to reset the timer lock: 1. Press the center of the LCD screen to remove the protective film. 2. Locate a small hole under the screw on the left side of the screen. Use a metal pin or clip to press into the hole. 3. When a "Beep" sound is heard (in sound mode), the LCD will display correctly. 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 color variation from the actual product. Measurement error allowance is +/- 1-3cm.