Their description:
Product Description
The 65 Watt AC Adapter from PWR+TM is specially designed to meet the power needs of your Apple systems. The adapter enables you to simultaneously operate your system and charge its battery from electrical power outlets inside your car. Packed with 65 Watts of power, this lightweight and easy-to-carry plug adapter proves to be an optimized portable power source for your laptop while on the road…. More >>
Go & get it here - i can recommend it:
PWR+ Car Charger Dc Laptop Adapter Power Cord for Apple Mac iBook PowerBook G3 G4 PowerPC A1021 G 3 4 12″ 14″ 15″ 17″ 12 14 15 17 Inch 65w 65 watt Extra Portable Car Charger for Laptop Notebook Computer Battery Charger Notebook Power Adapter Supply Cord Plug