This GPK Systems Auto Power Adapter is the direct replacement for MacBook Auto Power Adapter The GPK Systems Auto Power Adapter enables you to power your laptop in your car. An energy-efficient power adapter, designed to draw minimal power. With integrated surge protector to guard against power fluctuations.If you want to use your computer in the car without using up the battery you can save energy and weight by using one of these high tech switch mode DC converters (car cords). They are so small, light and reliable you might want to leave your AC adapter at home. This travel adapter is a voltage-boosting DC/DC converter designed to power or charge a Macbook Air from an automobile power point or cigarette lighter. GPK Systems DC Converters are being used in: Automobiles, Police Cars, Emergency Vehicles, RVs, Motorcycles, Motor Homes, Trucks, Airplanes, Campers, Boats, Yachts, Cell Phone Towers, Solar Power Stations.. Features: -Can be used around the world . -Backed by a limited one-year warranty with service and support available from GPK Systems . Compatible series : MacBook: Macbook Pro 13- Or 15-inch 85w. The magnetic plug only fit 2012 year model MacBook Pro with Retina display. In the box: -GPK Systems Car Charger.