This seems to be a device that takes power from a car's cigarette lighter socket (DC12V or DC24V) and allows you to use a household AC100V outlet (up to 40W). Specifications: Input: DC12V/24V (for vehicles) Output: AC100V (same shape as a Japanese household outlet) Maximum output: 40W (quite small, so you can't use things like a hair dryer or rice cooker) Used condition, as-is.