These are the original animal repellers, which are an effective way to avoid vehicle Collisions because of the high frequency sound generated by air flowing through the units. The high frequency sound warns animals away from the vehicles and in ideal conditions can be heard up to 2km away.

Features:

Speeds over 55 kph.
Device alerts kangaroos,dogs and wildlife to the approach vehicle.
System improves protection rate against accidental damage caused by animal vehicle contact.
Radiates sound waves to warn animals of on-coming vehicle.
Can be cleaned to ensure continued unobstructed air flow.
Comes with key that allows for device to be removed for easy cleaning.
Sonic repellers aids animals colliding with motor vehicles.
High frequency sound generated by air flowing through the units.
Warns animals away from vehicles. 
Ideal condition sound can be heard by them up to two km away.
Two units supplied are ready for installation. (around the bumper area of the vehicle)
Ensure that surfaces are clean, flat and dry before using double sided tape provided.
Make no claim that these units will prevent collisions with all animals in all situations.
Made in U.S.A.