charges two compatible devices up to 4 times faster simultaneously than traditional charger. Car charger adapter provides protection against overload, overvoltage, overcurrent, overheat and short circuit.comes with a built-in 10A fuse wire can better protects your battery.(NOTE: USB car charger quick charge is only supported by the fast charge devices.)Aluminum Casing??Made of Aluminum alloy with better heat disation, which has advantage of non-flammable, wear resistant and good stability. Besides,its protective cap design enables it life splash-proof and dust-proof, it not only can use on car but also an excellent accessories for Golf Cart, Boat, ATV, motorcycle, bike, truck, RV, etc.Digital LED Display??This car charger builts in digital blue LED voltage monitor, displays the real-time voltage status of your vehicle??s battery,so that you could know the health of battery while driving and avoid voltage abnormal issue. Please pay attention when the voltage is under 12V.Easy Installati