Cylindrical design enables converter to fit into the drinks holder in vehicles. Converts 12V DC to 230V AC. Uses power via car cigarette lighter plug fitting. Ideal for use in caravans, boats, HGVs etc. for use with appliances that require mains power and have 3 pin UK-type plugs. Fitted with a USB port for charging mobile phones and MP3 players etc. Has on/off switch. Display packed.