USB rechargeable lithium battery with a digital display and three control buttons to set timing in hours or minutes, with a maximum setting of 99 hours and 59 minutes. The battery supports up to 120 hours of operation on a full charge. When locked, the device remains securely closed and cannot be manually forced open. Users are advised to set the timer appropriately for their needs. The combination lock design is suitable for travel, including airport use, and helps secure personal items to protect privacy. To reset the timer lock: 1. Press the center of the LCD screen to remove the protective film. 2. Locate the reset hole beneath the screw on the left side of the screen. Use a metal pin or clip to press into the hole. 3. When a "Bi" sound is heard (if sound mode is enabled), the LCD will display properly, indicating the reset is complete. 4. Reapply the protective film after resetting. Weight: 30g Color: Black Material: ABS Package Contents: 1 x Time Lock Note: The actual product color may vary slightly due to lighting and screen display differences. Measurement tolerance is +/- 1-3 cm.