This unit simply plugs into any standard, 12-volt DC vehicle cigarette lighter socket to convert your vehicle's battery power to 110-volt AC (common household current). It also features two AC outlets, an automatic overheat shut-off at 150F, low-battery alarm at 10.6V and automatic shut-off feature at 10.6V. Now you can keep laptop computers, PDAs, and AC appliances powered and operational wherever you go.