ProSelect 12-volt DC car adapter plugs into car"s cigarette lighter outlet to run the ProSelect crate fan while traveling. Comes with a 20-feet cord. Attractively packaged. Car adapter is designed for use with both the standard crate fan and deluxe thermostatic crate fan. Plug adapter into the adapter port on the side of the crate fan and plug into your vehicle"s cigarette lighter outlet. Turn fan on. Unplug from outlet when not in use. Keep cord out of reach of pet. Measures 4-1/2-inch length by 2-4/5-inch width by 1-4/5-inch height.