This smart timer lock uses a USB rechargeable lithium battery and has three small buttons to set hours or minutes, with a maximum setting time of 99 hours and 59 minutes. It can be used continuously for 120 hours with USB charging. Once locked, it cannot be opened or pried open by hand. Set the time correctly. This combination lock is lightweight and portable, suitable for airport and travel security. You can lock important items at any time to protect your privacy. Model: Smart Timer Lock Weight: 60g Function 1: LCD Timer Lock Function 2: USB Rechargeable Temporary Timer Lock If you find that the timer function is not working or the LCD screen is displaying incorrectly, follow these steps to set the timer: 1. Press the center of the LCD screen and pull off the protective film. You will find a clip under the screw on the left side. 2. Locate the metal pin or clip, insert it into the clip hole, and tighten. 3. When you hear a \"beep\" (in sound mode), the LCD screen will display normal time. The timeout time has been reset. 4: Replace the protective film on the back. Color: Black Material: ABS Dimensions: 7.3 x 4.7 x 2 cm Package contents: 2 x Timer locks Only the above package content is included; other products are not included. Note: Light and different screens may cause the color of the product in the image to differ slightly from the actual product. The measurement error is +/- 1-3 cm.