General description AlwaysH 4Pcs Ultrasonic Deer Whistle is a sound warning device designed to repel wild animals and prevent deer collisions, enhancing driving safety. This device is friendly to deer and other animals such as elk, antelope, and kangaroos, helping to save wildlife while reducing vehicle collisions. Technical specifications Includes 4 deer whistles Material: Premium ABS plastic with a matte surface Effective range: 1/4 mile Minimum driving speed for effectiveness: 35 mph Compatibility and accessories Compatible with all cars, vehicles, SUVs, trucks, ATVs, motorcycles, and more Installation Easy to install: Remove the adhesive backing and stick the whistle to the front bumper, rearview mirror, grill, or any flat surface of your car, ensuring it faces forward Can be easily removed when not in use Usage Effective in all types of weather; bad weather does not affect its performance Emits a loud whistle when the wind blows, attracting the attention of animals