4 Deer Whistles Sonic Wildlife Warning Device Animal Alert Car Safety Accessory Specifications: Color: Black Material: ABS Suitable for: Universal Features: Function：These deer car whistles devices make a sound automatically while the car speed reaches  35km/h to drive animals away over a distance of several kilometers, which helps to avoid accidents caused by animals crossing the road. Easy installation：First,clean and dry the surface where you want to install the deer horns on your car；And then,Tear off the double-sided tape ;Lastly,Press on it firmly for several seconds. Special appearance design：The deer whistle device with its small size can be attached to all types of bumper or grill, which is hard to notice and won't affect the appearance of your car. Durable：Made of superior ABS quality with excellent craftsmanship to ensure its long service life and durability. Packaging include: Deer Whistles*4