Draper 12V 200W DC-AC Inverter With USB takes 12V DC from a vehicle's battery and converts it to 230V AC. Used with appliances that have 3 pin UK-type plugs. Fitted with a USB port for charging mobile devices this makes the chargers flexibility ideal for use in caravans, boats, HGVs etc. For safeguarding appliances, the unit is fitted with an overload alarm and reverse polarity protection.