Three Optional Power Supply Methods: The car mouse protection device has 3 power supply methods to choose from. Insert 4 AA batteries (not included). Or use a DC to USB cable to connect the DC 5-12V adapter (not included in the scope of supply). The red and black wires of the mink repellent are directly connected to the 12V car battery.Wide Application Equipment: Since rats and other destructive rodents often hide in hidden corners and damage your property. This car repellent disrupts the central nervous system of rodents through high-frequency varying ultrasonic waves and LED flashes. By creating an unfriendly living environment, it prevents rodents from re-entering your vehicle and other protected areas such as garages and attics.Effective and Environmentally Friendly: The under-hood ultrasonic rodent repeller is a humane way to repel rodents by changing ultrasonic waves. Combined with an LED light, this car engine animal repellent can keep rats, mice, minks and other rodents away from your vehicle and other objects. It minimizes direct contact between humans and other disease-carrying rodents while also protecting the environment.[High range]: The ultrasonic emission range can reach 40 square meters. Since they do not penetrate walls, we recommend using one plug per room. Ultrasonic mouse deterrents are ideal for all cars, engine rooms, houses (attics, garages, basements) and protected outdoor areas (garden, patios, barns). Working temperature: -25~+80.Smart Start & Stop: Contains a vibration sensor that turns the device on when the vehicle is stationary. If vibration is detected when starting the vehicle, the rat repeller switches to standby mode. When the car is stopped, the rat repeller comes into play again.