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4 Pack Deer Warning Whistle for Car,Deer Warning Unit Animal Whistle with Extra product details [High Quality Material] Our deer whistle is made of high quality ABS plastic. Its surface is rough and durable. It can withstand extreme outdoor temperature and provide greater stability. [Save Lives] The whistle deer warning device is very friendly to animals. The purpose of the deer whistle is to prevent the deer from running in front of your car, save animals and improve driving safety, and also reduce vehicle collision. If you need to drive through deer dense areas and are always worried about accidental injury to deer, our deer warning post is your necessary tool. [Easy to Install] Just remove the adhesive backing and stick the whistle on the grille, front bumper, rearview mirror or any flat position of the vehicle. Make sure that the larger end faces forward and the deer whistle is flush with the horizon. The ideal place is the place with the most airflow, followed by grille and front bumper. [Widely Used]The deer horns for cars is applicable to all automobiles, SUVs, trucks, motorcycles, ATVs, etc. [Note] The whistle will emit a loud whistle in the wind, but it is only effective when the car is traveling at least 35 miles per hour and the distance from the deer is 1/4 miles.