here is the spec sheet on it
http://www.duracellpower.com/datasheets/powersource-mobile-100.pdf
and the advertisment
http://www.duracellpower.com/powerpacks/powersource-mobile-100.asp
probably has in it 3 fat li-polys or 6 x 18650s, has about 40 watts of available power.
runs like any cheap AC converter , off car battery or its internal batteries, charges via the ac charger or via a car plug.
i would like to know what planet these guys live on when they say this
Handheld power tools: drills, jigsaws, sanders and buffers
Household appliances: compact microwave ovens, bread makers, food processors, small bar refrigerators, small vacuum cleaners, fluorescent and incandescent lights, sewing machines and fans
ok i will give them the incadescent light, the fan and a tiny vaccume, mabey a sewing machine on a good day, but the rest of them soak up power for a living
and would not run via this thing at all, some of the items listed even in the "super compact" version of them have 500-1000W power consumption. i guess they missed the hair dryer and toaster
if your going to BS might as well do it big.