USB charging with lithium battery, with three small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes. The USB charge lasts for 120 hours. Once the lock is locked, it will not open and it is impossible to open it manually. 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 Feature 1: LCD time lock Feature 2: USB rechargeable temporary timer padlock If you find that you cannot use the timeout or the LCD screen is not displayed correctly, follow these steps to set the timer: 1: Press the middle of the LCD screen to remove the protective film. You will find a stop under a screw on the left side of the lock. 2: Find a metal pin or metal clip and insert it into the hole to the stop and then run it. 3: When you hear a Bi sound (in sound mode), the LCD screen will be displayed correctly. The timeout has been reset. 4: Glue 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 content, other products are not included. Note: Light and different displays may cause the color of the item to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.