NASCAR Tony Stewart 20 Fiber Reactive Towel Emits a combination of fluctuating sonic waves, ultrasonic waves and LED flashlights to deter pesky animals from entering your vehicle Simple 2 wire installation under the hood to vehicle battery to provide power to the device; Easy to mount with included zip ties Low voltage protection, automatically stops working to protect the vehicle battery when battery voltage drops below 10.5V Energy saving, auto standby to save battery power when the car is started, automatically resume work 20 seconds after the car is parked Designed for vehicles but can be utilized almost everywhere such as garage, attic, barn where a 12 or 24 Volt battery is available