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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.