USB rechargeable lithium battery with a digital screen and three small buttons to set hours or minutes. Maximum setting time is 99 hours and 59 minutes. Fully charged battery lasts up to 120 hours. When locked, the padlock cannot be opened manually. Set the time appropriately for security. Lightweight combination padlock suitable for travel and airport use. Secure personal belongings and protect 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 and insert it into the hole to activate the reset function. 3. When a "Bi" sound is heard (in sound mode), the LCD will display correctly. The timer has been successfully reset. 4. Reapply the protective film. 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 allowed is +/- 1-3cm.