MrDEB, you mistake what I'm saying as a conversation about right or wrong. It's a simple point about living organisms. It CAN NOT WORK. I live near a lake with a lot of farm land and forest/swamp near the lake. I know ALL about deer. You stay out of their way, drive slower during their active times and if their populations get out of control you increase hunting permits. But don't be naive and think a silly little siren is going to suddenly solve deer issues in your area, this HAS been done before, and it hasn't worked, or there still wouldn't be deer problems all over the place. I'm not saying don't try, but this is not a new idea. I see worry about landscape and gardens and car bumpers, and no worry about DEER. There have been deer whistles available for cars for YEARS, oscilating ones too to produce warbles. They don't work! The deer have NO CLUE what the noise means from a distance, get used to it and still get hit by the vehicle.