1.[Cigarette lighter]:The plug length 2.16 inch. The right side cigarette hole can used for car device also can used for cigarette lighter.Very convenient when you need heat.^ 2.[Expand Advantage]: Convert and increase your car cigarette lighter from 1 socket to 3 sockets and 2 USB ports, can charging up to 4 devices at once. Dual power socket, total output 80W, Fit for 12/24V car. Fit for multiple devices on the road.^ 3.[Dual USB Port]:2 USB port can intelligent output current according to charge devices.Total output 5V/3.1A.Intelligent circuit design protects against short circuiting, over-heating, over-currents, and over-charging. Compatible for Apple, iphone,ipod,ipad,tablet, Samsung Galaxy,HTC,LG,kindle.^ 4.[Display Car Battery Voltage]:LED show car battery voltage when put in the car cigarette lighter.Let you always keep battery state of health and safe.^ 5.[Independent Switch]:Each cigarette lighter has independent switch and separate lights , easy to on-off. The device can be rotated 90 degrees, make convenient for people to use.