These handy sonic animal repellers fit to the front of most vehicles with the attached mounting tape. They can be helpful in warning off most wildlife such as kangaroos thus reducing the cases of accidental damage. As air flows through the repeller it produces an ultra sonic sound that can warn animals of approaching danger. Protect vehicle from kangaroos Works at speeds over 50kph. Warns animals up to 2 km away. Chrome finish. Haigh make no claim that these units will prevent collisions with animals in all situations.