SAVING LIVES AND PROPERTY: two pair of whistles deer warning devices is friendly for animals. Deer warning can emit ultrasonic automatically day or night at speeds above 35 MPH and will warn deer up to 1/4 mile . The purpose of the deer whistles is to stop the deer from running in front of your vehicle. HIGH QUALITY DEER WARNING DEVICE: Made of premium plastic which can resist all weather, even stay at outside extreme heat or below freezing, the device can work well. QUICK& EASY INSTALL AND REMOVE: Just peel off the tape cover and stick the device to your bumper or grille. And the whistles can conveniently be removed from base for wash your car. Two deer warning whistles are recommended per vehicle. Material: ABS Compatible: all Cars, SUV, Truck, Motorcycle and ATV. Color: Black About 4 Pair of Save a Deer Whistles Deer Warning Devices for Cars & Motorcycles If you have to drive through areas where there are free range cattle and wild animals quite often or you live in an are highly populated with deer. If you want to save a deer and save your life. deer warning whistles are a must for getting animals from the traffic. Get the Animals Attention & Save a Deer When your car is moving at 30 mph or faster, deer warning whistles can automatically emit a high-pitched noise which is annoying to the animals and encourages them to quickly move out off the direct path of the noise. The ultrasonic is inaudible to humans or pets inside your car, as it is way out the normal hearing range of people. But Wild Life, sure does hear it.and deer will turn and run without being harmed 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. Packaging including: 4 x open whistle; 4 x close whistle Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.