Note: Compatible with all cars, vehicles, SUVs, trucks, ATVs, motorcycles and more. The range is 1/4 mile and only works when the car driving speed is at least 35mph. Our deer warning device is friendly to deer and other animals, such as elk , elk, antelope and kangaroos. Save animals and increase your driving safety also reduce vehicle collisions at the same time. High Quality Deer Warning Whistles: 4 deer whistles included in the package. Our deer whistles are made of premium ABS plastic with matte surface, stable, sturdy and durable, which can provide greater stability. It is useful in all types of weather, bad weather will not affect the effect. Easy to Use: Convenient to install and remove. All you need to do is remove the adhesive backing then stick this deer whistle to the front bumper, rearview mirror, grill or any flat surface of your car, keeping the deer whistle facing forward. Before. When you are not using it, it can be simply removed as well. Save Deer and Increase Safety: If you have to drive in areas with high deer population, and you are still worried about hurting deer by accident, then our deer warning whistle is a must-have for you. An open-hole whistle emits a loud whistle when the wind blows, attracting the attention of animals and calling deer to order.V