Working Principle - This product adopts ultrasonic frequency conversion. Effectively stimulate the nervous and auditory systems of mice within a controlled range to expel them. Intelligent start and stop - can automatically detect the working state of the car and automatically stop working after the car is started. car. MATERIALS - Made of strong ABS material and precision melted flame retardant material to ensure smooth operation inside the engine compartment. Total protection - It has a working range of up to 40 meters and covers the whole car, preventing rats from damaging your car’s wires. SAFE - Ultrasound will not disturb people or pets, kill not pests and rats, just drive them away, no need to worry about dead pests in the car. High temperature resistant materials The precise melting of the material ABS and flame retardant material ensures that the product works correctly in the engine compartment Flashing frequency conversion output The output time is also changed at regular