Additional speakers for Kerbl Manufacturers 29986 Felix, 400 ultrasound device. For the additional speakers is the Felix 400 ultrasound device required modern and efficient system for the displacement of mice and rats environmentally friendly and not harmful to people or for pets the ultrasonic is pushed from mice and rats vernommen This, and it will take the areas of application: Hutches (L * W * T) escape, larger in various places, such as warehouse, offices, houses, wine cellar, restaurants, hotels, cafes, etc.