USB lithium battery charging. Features a screen and three 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 locked, the mechanism cannot be opened or broken by hand. Please set time reasonably. This combination padlock is suitable for airport and travel safety, allowing you to secure important items and protect your privacy. To reset the timer lock if it is inoperable or the LCD is not displaying correctly: Press the center of the LCD screen to strip off the protective film. Locate the small hole under a screw on the left side of the screen. Insert a metal pin or clip into the hole. When you hear a beep sound in sound mode, the LCD will display correctly and the timeout has been successfully reset. Please glue the protective film back on. Weight: 30g. Color: Black. Material: ABS. Package Contents: 1 x Time Lock.