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 usage. When locked, the device remains securely closed and cannot be manually forced open. Please set the timer appropriately. The padlock design is suitable for travel and airport security; ideal for securing personal items and protecting privacy. How to reset the timer lock: If the timer does not respond or the LCD display is not functioning correctly, follow these steps: 1. Press the center of the LCD SN to remove the protective film. Locate the reset hole under the screw on the left side of the SN. 2. Use a metal pin or clip and insert it into the reset hole, then press gently. 3. When a "beep" sound is heard (in sound mode), the LCD will display properly, indicating the timer has been reset successfully. 4. Reapply the protective film after resetting. Weight: 57g Color: White Material: ABS Package Contents: 1 x Time Lock Note: Other items not included. Note: Lighting reflections and display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.