This car deer whistle warning device is made of ABS plastic, is durable and wind-activated, it can repel deer while the car is moving, avoiding accidents when the animal crosses the road suddenly, it can be a good helper when you are driving in the wilderness. Specification: Brand: JOYCOURT Name: Car Deer Whistles Color: Black Material: ABS Size: Approx. 2.99×2.71×1.57cm/1.18×1.07×0.62 inch Applicable: Most vehicles Features: -The car deer whistle is made of high-quality ABS material, weatherproof, reliable and sturdy, not easy to deform or break, The acrylic adhesive has good adhesion, sticks firmly, not easy to fall off. -Helps to warn deer, elk, coyotes, foxes, antelope and kangaroos approaching the vehicle, which can effectively prevent animals from colliding with vehicles. -Car deer whistles have a dual wave frequency that is activated by wind and can be activated while driving to physically repel animals.