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These are small devices people mount on their motor vehicle in the belief that the sound generated by the device will somehow deter deer from entering the pathway of the traveling vehicle. Marking claims suggest that air moving through the device will produce ultrasonic sound waves that warn deer of a vehicle's approach. The deer will then know to "stay clear" of the vehicle to prevent a deer-automobile collision. Their manufacturers promote them as "acoustic attention-getter" devices, alleging deer would react to the whistle by remaining still or clearing out of the way.These are small devices people mount on their motor vehicle in the belief that the sound generated by the device will somehow deter deer from entering the pathway of the traveling vehicle. Marketing claims suggest that air moving through the device will produce ultrasonic sound waves that warn deer of a vehicle's approach. The deer will then know to "stay clear" of the vehicle to prevent a deer-automobile collision. Their manufacturers promote them as "acoustic attention-getter" devices, alleging deer would react to the whistle by remaining still or clearing out of the way. [[File:deerwhistlesfordummies.jpg]]Plenty of research has been published to refute any claims of the advertising effectiveness. Those studies include those conducted by the Georgia Game and Fish Department, Acoustical Society of America's Acoustics Research, the University of Wisconsin–Madison, and the Ohio State Police Department, all of which conclude that the deer whistle will have no influence over whether or not a motorist collides with a deer or any other animal.Plenty of research has been published to refute any claims of the advertising effectiveness. Those studies include those conducted by the Georgia Game and Fish Department, Insurance Institute for Highway Safety, Acoustical Society of America's Acoustics Research, the University of Wisconsin–Madison, and the Ohio State Police Department, all of which conclude that the deer whistle will have no influence over whether or not a motorist collides with a deer or any other animal.[[Category:Buyer Beware]]