Specifications: Material: ABS Color: Black Weight: 25 g Size: 5 * 2.3 * 2 cm / 1.97 * 0, 91 * 0.79 inches Scope of delivery: 2 x deer warning whistle With this game warning you reduce the chance of an accident caused by deer crossing - the game warning drives away deer, deer, dogs, cats and other animals which are sensitive to high-frequency ultrasonic noises. From approx. 50 km / h the whistles generate ultrasonic noises. Noises that can be perceived by animals up to 400 meters - people and animals in the vehicle cannot hear the noises. Due to the (completely removable) self-adhesive surface The whistles can be attached to the vehicle in a matter of seconds (e.g. on the front spoiler, lower / upper edge of the bumper, invisible behind the radiator grille, and much more.) "