Emits a high-pitched sound that repels animals like deer, dogs, cats, rabbits squirrels and more. It generates the frequency up to 725 ft. in front of your vehicle. And it has multiple features that let you turn it on continuously, turn it off or set it to activate at 30 or 50 mph, so that it emits the repelling sound only when traveling at higher speeds. Simply mount it inside the front grill (mounting bracket, screws and all hardware included), switch to on, off or auto and activate the set speeds, 30 mph or 50 mph. The sound starts automatically when your car reaches the selected speed, stops when the vehicle slows below it. Powered by your car battery. Measures a compact 2 1 / 10 x 3 1 / 2 x 1 4 / 5 ”