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 supports up to 120 hours of usage. When the lock is engaged, it remains securely closed and cannot be opened manually. Set the time appropriately for optimal use. The padlock is lightweight and suitable for travel and airport security. Secure your valuables anytime to protect your 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. 3. Insert a metal pin or clip into the hole to initiate reset. 4. When a "beep" sound is heard (in sound mode), the LCD will display correctly, indicating the timer has been reset. 5. 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. Measurement error is +/- 1-3cm.