The product is powered by a conventional 12V car battery and does not require an additional power source, making it easy to install and use. Reverse polarity protection function. Avoid damage to the product due to reverse circuit connection. The product has a self-test function when powered on. When installed for the first time and the switch is turned on, the product enters the automatic detection function to detect whether the functions of each component are good or bad. The red light, white light, and high-frequency transmitter are detected in turn. Low battery voltage detection function. The product detects the battery voltage during operation. If the voltage is too low (below 9.2V), an alarm will sound and the product will stop working to prevent loss of charge and protect the battery. When the battery voltage is restored, the product automatically stops the alarm and enters standby mode. Variable frequency output. The product uses sweep frequency output and fixed frequency output, and the output time also changes at regular intervals, which reduces the hearing resistance of mice and makes work easier. White LED light flashes. The flashing white LED inside the car has a more scary effect. Vibration detection. This product has a vibration detection function. When starting, the vehicle vibrates. As soon as the vehicle detects a vibration, it stops. This prevents pests such as mice from damaging the vehicle and reduces power consumption. When the car stops and the vibration stops, the product thinks the person has left and automatically starts the working mode after 5 minutes, keeping the car in the place of people and protecting the car from pests such as rats. Note: The data are all manually measured, please allow an error of 1-3 cm. Due to differences in light and display, there may be some color differences, please refer to the actual item received.