USB charging: The self-locking padlock has the built-in lithium battery, LCD screen and buttons. Timing: The electronic padlock can be set in hours or minutes, and the longest setting time is 99 hours and 59 minutes. Unique unlocking design: The USB charging padlock does not require complicated operations, just set the unlocking time. Versatility: Padlocks with LCD screens are used to lock addictive items such as mobile phones or snacks. Wide range of applications: Lock addictive items such as cigarettes, medicines, mobile phones or snacks. Suitable for kitchens, gymnasiums and schools. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.