Marten protection car: By emitting constantly changing ultrasonic waves (15 kHz-36 kHz) and flashing flashing light, the nervous system of the rat is stimulated and destroyed. This can affect the rat's vision and cause it to escape. The ultrasonic waves can have a range of up to 50 square metres.Highly safe mouse repellent: The mouse deterrent has been developed for the sensitive frequency of martens or mice. It is safe for human body and pets and does not affect other car parts or engines.Three methods of power supply: the ultrasonic against rats can be powered by 4 AAA batteries (not included), a car battery and a DC USB converter. It can be installed in the boot, under the bonnet or in the car seat.[High temperature resistant material] The mouse and rat repellent is made of environmentally friendly and high-quality ABS material, durable and high temperature resistant. When the battery is used, it cannot be operated at high temperatures.Intelligent start and stop: the ultrasonic marten deterrent also uses a vibration induction switch. With the automatic standby function, the marten deterrent goes into standby mode when starting the vehicle to save battery power. When the car no longer drives, the marten deterrent works again.