The US$250 WaveBox portable microwave oven weighs just 6.3 kg (14 pounds), runs on mains voltage regardless of country, and can also run from a 12 volt battery using alligator leads or from your in-vehicle power outlet.
CAR MICROWAVE! - The Only Portable Microwave Oven. DescriptionLifetime Guarantee The only one of its kind, this portable microwave oven allows you to bring the convenience and power of dielectric heating wherever you go. The microwave plugs into a wall outlet, a car or boat's DC outlet, or connects to a car battery (jumper cables provided), allowing you to make popcorn or reheat food at campsites, tailgate parties, or during boating excursions.