Portable Car Fuel Saver is a proven device that helps save fuel in the car. It is used in fuel, diesel and gas vehicles with 12 voltage cigarette lighter socket. Portable Car Fuel Saver! A breakthrough, patent-pending invention in fuel economy. By simply plugging it into your cigarette lighter socket, you will increase your vehicle's mileage, join more than half a million satisfied customers, and save a lot on your vehicle's gas bill. Plug the product into your car's cigarette lighter and start saving instantly. You'll also get more horsepower, better acceleration, longer battery life and cleaner emissions. How does it work? This is an electronic device that works electronically in your car's alternator. If your alternator power goes down, this product will help increase car voltage and help power devices such as lights, stereos and even reduce air conditioning in cars. It also assists your car battery to provide the power needed to run this device. Apart from these, this product provides the power that helps your ignition system and also prevents incomplete combustion of your vehicle exhaust. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.