Neo Socket is the largest technology, a breakthrough invention and patented device that could save fuel consumption by 10-30%. The Fuel Shark works by stabilizing your car's electrical system for enhanced performance and increase gas mileage. Neo-Sockets also helps improve car's engine acceleration and the perfomance of on board equipments such as stereo, air condition and lights. Using the Fuel Shark has proven to increased fuel mileage, produce cleaner emissions, increase horsepower and provide long battery life. Just plug-in the Fuel Shark into the 12V cigarette lighter of your car, and Neo- Socket Fuel Shark Saver starts working instantly by indicating a blue light on it. This Fuel Shark works for both Petrol, Diesel and Gas engines