USB lithium battery charging with SN and three small buttons to set hours or minutes; maximum setting time is 99 hours and 59 minutes. USB charging provides up to 120 hours of operation. When locked, the device remains securely closed and cannot be manually forced open. Please set the timer appropriately. The padlock is suitable for airport and travel security. It allows you to secure personal items and protect privacy. Model Number: Smart Time Lock Weight: 30g Feature 1: LCD Time Lock Feature 2: USB Rechargeable Temporary Timer Padlock If the timer does not operate or the LCD does not display correctly, follow these steps: 1. Press the center of the LCD SN to remove the protective film. Locate the reset button under the screw on the left side of the SN. 2. Use a metal pin or clip to insert into the hole and press the reset button. 3. When a "Bi" sound is heard (in sound mode), the LCD will display correctly. The timer has been reset successfully. 4. Reapply the protective film. Color: Black Material: ABS Size: 7.3 x 4.7 x 2 cm Package Contents: 1 x Time Lock Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.