1. Useful Tool: The air flowing through the deer whistle produces sound/ultrasound, which can alert deer, elk, moose, antelope and kangaroos approaching the vehicle, effectively avoiding collisions between deer and vehicles 2. Safe for you and your pets: The deer warning device comes with 50 whistles, 25 of which produce sound waves and the rest produce ultrasonic waves; however, people and pets in the car (such as dogs, cats) cannot hear them, so there will be no damage to your ears or 3. Easy to install and remove: Simply peel off the adhesive backing and stick the whistle to the grille, front bumper, rearview mirror or any flat place on the vehicle; make sure the larger end is facing forward and the deer whistle is flush with the horizon; the ideal location is where the air flows the most, followed by the grille, front bumper, and they can be easily removed from the base when the car needs to be washed. 4. Premium Animal Alarm: Made of high-quality plastic, sturdy and durable, this animal alarm whistle can withstand bad weather; it works well even when left outdoors in extremely hot or extreme weather conditions