Features: It usually takes more than 5 seconds to lock a car with a U-shaped lock, and the process can be time-consuming, especially when frequently getting on and off. Bending down repeatedly can also be inconvenient. Sometimes, users only step away briefly, such as when purchasing items or using the restroom, and may not want to fully lock the vehicle. This alarm device offers a quick and convenient alternative. With a simple press of a button and password adjustment, the system can be activated. Installation is straightforward—only two screws are required. To use, simply change one or more digits of the password as needed. A 9V battery is required (not included). In colder climates, it is recommended to use a battery with better cold resistance. When the alarm sound becomes weaker, replace the battery with a new one. Remove the battery if the device will not be used for an extended period. Operation Method: 1. To arm the device, press the red lock button. A beep will sound, indicating the device has entered armed mode and is actively monitoring. 2. To disarm, press the unlock button. Two beeps will confirm the alarm has been deactivated.