The Worlds Smallest Cup Inverter This 180W modified wave power inverter model will allow you to power your mobile devices in your car, boat or RV. This cup inverter is ultra compact, plugs into your vehicles cigarette lighter socket or attaches to a car battery and fits securely in most vehicles cup holders. With 4 USB ports and 1 standard North American outlet, you can run and charge up to 5 devices at once, keeping you connected wherever you go.