USB lithium battery charging, with 3 small buttons to set hours or minutes. The maximum setting time is 99 hours and 59 minutes. USB charging lasts for 120 hours. Once locked, it cannot be opened or broken by hand. Set the time reasonably. This combination padlock is lightweight and suitable for airport and travel security. Lock your valuables anytime to protect your privacy. Model Number: Smart Time Lock Weight: 60g 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 does not display correctly, do the following to reset the timer: 1: Press the middle of the LCD screen to remove the protective film and tear it off. You will find a stop under a screw on the left side. 2: Find a metal pin or metal clip and insert it into the hole to the end, then run it. 3: When you hear a "Beep" sound (in sound mode), the LCD screen will display correctly. The timeout has been reset. 4: Please stick the protective film back on. Color: Black Material: ABS Size: 7.3 x 4.7 x 2Cm 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 in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.