The 12V automotive pest repeller uses the principle of ultrasonic wave vibrations. Ultrasonic waves attack the auditory and nervous system of most pests, effectively deterring intruders. These high-frequency waves are beyond the range of audibility for the human ear and most domestic animals. Effectively deters: mice, rats, martens, polecats, weasels, and other rodents from under the car hood. Product Features: - ultrasound 20-60kHz - harmless to the surroundings - low energy consumption - max 24mA - power supply 12V - operating temperature -20 / +80 degrees. C - dimensions 10 x 7 x 2 cm - operation indicator diode - built-in fuse