Useful Tool: The air flowing through the deer whistle creates sound/ultrasound, which can alert deer, elk, moose, antelope and kangaroos approaching the vehicle, thus effectively avoiding deer and vehicle collisionsSafe for you and your pets: The deer warning device comes with 2 whistles, however, people and pets (such as dogs, cats) in the car cannot hear it, so it will not harm your ears or healthEasy to install and remove: Just remove the backing and stick the whistle on the grille, front bumper, rearview mirror or any flat place on the vehicle; Make sure the larger end faces 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 washedHigh-quality Animal Alarm: Made of high-quality ABS plastic, it is strong and durable to withstand bad weather; It works even in extremely hot or cold weather conditionsDriver Safety Accessory: This device is a must-have car accessory for drivers who live in the wild; The whistle generates ultrasonic frequencies and emits a warning sound, thereby reducing vehicle collisions