The Save-A-Deer whistle is an animal alert, deer warning device that aids in accident prevention with animals. Help save human and animal lives through reduced deer and vehicle collisions. Not to mention, you will be able to avoid the severe damage animals can do to your vehicle. The Save-A-Deer whistle is the smallest and best single unit air-activated animal alert /automobile deer whistle design on the market today. When mounted to a vehicle, car, truck, or motorcycle moving at 35 mph or faster, the deer whistle makes a sound that alerts deer, moose, elk, antelope, and kangaroos of the approaching vehicle and assists with accident prevention. Animals are very unpredictable, but they will usually respond by freezing along the side of the road avoiding vehicle collision. Occasionally the animals will perk their ears and look over at the vehicle. You should always exercise caution when driving in areas heavily populated with animals. You should examine the deer whistle occasionally to be sure it is still mounted to the vehicle and does not have any blockage in the holes. Our whistles make a great auto deer protection device to help reduce chances of deer and vehicle collisions. Over 2 million Save-A-Deer whistles have been sold world wide!