Features: Uses 12V conventional car battery for power supply, no need to use another power supply, easy to install and use. Reverse connection for protection function. Prevent the reverse circuit from causing damage to the mouse repeller. Power-on self-check function. When it is installed for the first for time and the switch is turned on, the product enters the automatic detection function to detect the function of each component. Red light, white light, and high-frequency transmitter are detected in sequence. Battery low voltage detection function. The product will detect the battery voltage during operation. If the battery voltage is too low (less than 9.2V), the product will sound an alarm to indicate that the voltage is too low and will no longer work at this for time to prevent battery power loss and protect the battery. When the battery voltage is restored, the product will automatically stop alarming and enter the standby state. Frequency conversion output. The product uses the sweep frequency output and the fixed frequency output, and the output for time is also changed at intervals, which reduces the hearing resistance of mice and makes it easier to function. The white LED flashes inside the car has a more shocking effect. Vibration detection. It has a vibration detection function. When the car is started, it will drive the product to vibrate. When the product detects this situation, it will stop working. At this for time, rats and other pests will not harm the car and reduce power consumption. When the car stops and the vibration stops, the product thinks that the person has left, and automatically turns on the working mode after 5 minutes to replace people on duty and protect the car from pests such as mice. Specifications: Product name: Car Ultrasound Mouse Repeller Material: ABS Working voltage: for DC 12V Working current: 40mA Standby current: 5mA Working frequency: 12kHz-25kHz Color: As pictures shown Size: app.7x10cm/2.76x3.94in Quantity: 1set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Mouse Repeller 1 x Instructions Manual Some Accessories (other accessories demo in the picture is not included.)