AAA Communications Car Deer Alert/Auto Deer Whistle Horn - Portable Electronic Whistles AVOID VEHICLE ACCIDENTS Electronic audible alert device warns deer, moose, pets, and other animals Warns deer and other animals approaching vehicle from up to 2,000 feet away This model is the only portable magnetic mount unit with a car power adapter This patent-pending system is the only portable deer whistle on the market You can install in seconds rather than hours with other electronic deer alerts