The Wagan Heated Seat Cushion provides warmth and comfort. Perfect for cold weather driving, it provides soothing heat for tired and sore muscles. A high/low/off switch allows you to control the heat setting. Simply plug it into your vehicle's 12-volt DC outlet to use. Made of polyester with a 4.3-foot DC cord. Straps secure it to the back of your seat and hold it in place, with a universal fit for most cars, trucks, RVs and boats. It's light and portable so it is convenient to take from one car to another. Enjoy soothing heat in the comfort of your vehicle. An optional AC adapter is available for home and office use (Wagan item number 9903 AC adapter).