Save your money.

Like most animals, if nothing bad happens to the deer they'll tend to ignore it after a while.

I know that a police cruiser can "out-run" it's siren. So, it makes sense that you could "out-run" this gadget. If you're traveling fast, by the time the deer hears it, all you are doing is startling the deer and causing him to stop in the middle of the road instead of walking across it. At slower speeds possibly, the deer hears this gadget before he hears the car, alerts and has time to evade.

Just a theory - somehow, it makes some sense.

My wife also has that radar like capability. Only its effectiveness is reduced considerably becuase it's non-directional.

Wife: DEER!!

Me: Where?

Wife: Over there!

Car: Sreeching brakes...

Me: sigh....

Yea but I thought it might be one of those things that would be beyond my hearing range and I wouldn't here it. I guess it did keep me from hiting dear when I had it on my truck though, it drove me crazy and I didn't drive much as a result.

My wife once said "deer," I replied "what sweetie?,", then then pointed and said, much louder, "deer!!!" I barely missed them...

There are two groups of people:

The ones who say, "There! There!"

And the ones who say, "Where? Where?"

One thing I've always wondered about: if you have a deer hunting license in your car, and you hit a deer, can you keep it? Can you keep it if you shoot it to put it out of its misery?

Sue

Here is a link to a study on these devices.

http://www.deercrash.com/Toolbox/CMToolboxWhistles.pdf

The short story is the results are inconclusive.

thanks to all of you for your replies.

i've decided to pass on purchasing these. based on your first-hand experiences, and the study referenced, there's not enough evidence to support installing them.

I did have a friend in Lousianna who had an excellent deer deterent he would drive down the road with a .357 on the seat and every time he would see a deer he would poke the gun out the window and shoot at the deer. This worked great since he never in the 5 years I knew him hit a single deer .

That sounds like a Cajun Prevention system!!! Lessez le bon ton roullez !!!!!!