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, making it impossible to tamper with. Set the time reasonably. This padlock is lightweight and suitable for airport and travel security. Lock your valuables anytime to protect your privacy. Model Number: Smart Time Lock 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 displaying correctly, follow these steps: 1: Press the middle of the LCD screen to remove the protective film and peel 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 and then push it in. 3: When you hear a \"Bi\" sound (in sound mode), the LCD screen will display correctly. The timeout has been reset. 4: Re-apply the protective film. Color: Black Material: ABS Package Contents: 1 x Time Lock