The ThinkPad 56W DC Automobile Power Adapter provides power to your ThinkPad, while at the same time recharging the system batteries even when you are miles away from an AC wall outlet. This adapter gives you the flexibility to use your ThinkPad longer and in more places without having to worry about running short of power. Features include: Plug in and use your vehicle's power outlet to add power to your ThinkPad Recharge your ThinkPad batteries while on the road.