Cibo Fuel Saver Save On Gas Economizer Save Gas Features Fuel Shark for Car Vehicles Plug the fuel shark into your car or truck's cigarette lighter adapter or dual adapter before turning the ignition on Start your vehicle. The LED light in your fuel Shark will come on Your fuel shark will last for approximately 3 years before you need to replace it Please do not use the fuelshark on hybrids or electric vehicles PLS NOTE that due to lighting effects, monitor's brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item!