Deer Screamer is the new style of Audible deer whistle, that any motorist ever concerned with striking a deer or other wildlife, has been waiting years for. DS is a minimum 35mph wind activate deer whistle that emits a human/ wildlife audible Whistle that gets louder with higher speeds, and is projected over 200yds in front of the traveling vehicle. Deer and most wildlife have excellent hearing, and depend on their hearing more than sight, yet the sound of engines and approaching vehicles does not interest them. But the wildlife “scream” of the DS in fact does. Most likely because it sounds like an animal that they have never heard before, which peaks their interest. Because they are curious they first stop, listen, and then look. That’s exactly what you want. They now have a visual of your vehicle, and that alone will dramatically lower your odds of a collision. Deer Screamer should be “mounted” in the grill in front of the radiator. This position allows the unit to get a direct and clean line or air that will insure a consistent whistle, and it will also receive heat, keeping it unclogged in the snow months. Why trust those old antiquated, ultra-sonic whistles from 30 years ago, that you can’t be sure Any wildlife can really hear? And that all the feedback and stories of their use, concluded that they just did not work.