With multi-contact high-voltage brushes, K&K has brought the pasture fence principle to perfection. The interlocking plus and minus brush strands effectively overcome the marten's "fur barrier" and thus increase the attack surface many times over. Most martens can be reliably driven away with pulsating ultrasonic sounds. However, an even stronger defense is required for particularly aggressive or older animals with altered hearing behavior. For this reason, the system combines an ultrasonic dome radiating at a 360-degree angle with the pasture fence principle. Since the device and its periphery are also absolutely waterproof, it can always be placed in the most strategic location in the engine compartment. The repellent device is suitable for towing vehicles as well as motor homes that have an (additional) 12 V power supply independent of external sources.