Warns animals of oncoming traffic. Quality guaranteed. The Deer Alert animal warning whistle radiates sound waves that will safely warn most types of animals of your oncoming vehicle. Passengers and pets inside your vehicle will not hear the high-frequency sound. Directions included. Quality guarantee and limited lifetime warranty. Call 800-962-6676 or visit http://www.causa.com/qualityguarantee for quality guarantee details and instructions. Made in Taiwan.