Repels martens through electrically charged high-voltage plates at approximately 200 - 300 V, which generate electric shocks in the vehicle's engine compartment. These are weak electrical pulses that only drive the marten away without causing harm. Additionally, strong, aggressively pulsating ultrasonic tones are used. The device automatically shuts off when the battery voltage drops below 11.5 V/DC. The base unit with ultrasonic sound emission is waterproof according to IP 65 and can be mounted directly at the entry point of the marten in the car. It features a built-in, brightly flashing LED.