USB lithium battery charging, with and 3 small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes. USB charging lasts for 120 hours. When the lock is locked, it does not open and it is impossible to break it open by hand. Set the time reasonably. The padlock combination is lightweight and suitable for airport and travel security. You can lock your important items at any time to protect your privacy. Model Number: Smart Time Lock Weight 30g Function 1: LCD Time Lock Function 2: USB Rechargeable Temporary Timer Padlock If you find that you cannot use the timeout or the LCD screen is not displayed correctly. Here's how to reset the timer: 1: Press the center of the LCD screen to remove the protective film and pull off the film. You will find a stop under a screw on the left side of the .2: Find a metal pin or metal clip and insert it into the hole to reset and then run it.3: When you hear a \"Bi\" sound (in sound mode) the LCD will display correctly. The timeout has been reset. 4: Paste the protective film back. Color: Black Material: ABS Size: 7.3 x 4.7 x 2 cm Package Contents: 1 x Time Lock Only the above package contents, other products are not included. Note: Light and different displays may cause the color of the product looks a little different in the picture than in reality. The permissible measurement error is +/- 1-3 cm.