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If you always drive through areas where there are animals quite often, Dr.roc deer warning whistles are a must for getting animals away from the traffic. Installation Guide This set of whistle contains 4 ultrasonic whistles and 4 wind whistles. Usually, one ultrasonic whistle(a whistle with hole in the tail) is matched with one wind whistle(a closed-hole whistle). This combination works best, when your car is moving at 30 mph or faster. Easy to install & remove Just peel off the tape to stick the whistles to the front of your car. Easy to remove from the base when your need to go through a car wash, replace, adjust, etc. Compatible: The deer whistle wildlife warning devices compatible with all Cars, SUV, Truck, Motorcycle and ATV.