Rodent repellents  have been manufactured to repel rats and rodents from your car by ultrasonic wave.To prevent the rats etc bait  the tube and wire line when they go into the interior of the engine to warm their body.

Using way:

As per the  instructions paper, just connect the connecting line onto the engine of the car,the rat repellents can connet to the power automaticly when the engine stops working,the repellers will sound ultrasonic wave every one minute to repelle the rodents.

voltage :12V    power : 0.1W    frequency  :7KHz 

working area  Effective for :30-50m2. The rat repellers can be used to get rid of pocket mice, kangaroo rats, moles, gophers, etc.

CE,ROHS,REACH certificate