This mobile marten repellent works with high-frequency technology (ultrasound). It can be used anywhere, such as in cars, barns, carports, garages, houses, and protected outdoor areas, making it ideal for protecting long-term parked vehicles. The optimal, maintenance-free operating time of 12 months can only be achieved with high-quality alkaline-manganese batteries. The device should be installed in a way that prevents water or dirt from entering the housing. It is also effective against mice and other rodents.