Dual QC3.0 USB PortsDual QC3.0 car charger adapter charges 2 devices simultaneously up to 4 times faster than conventional charging. Car charger adapter provides protection against overload, overvoltage, overcurrent, overheat and short circuit. USB car charger quick charge is only supported by the fast charge devices LED Voltmeter DisplayThis car charger builds in digital blue LED voltage monitor, displays the real-time voltage status of your vehicles battery for preventing problems caused by low voltage, the light also makes quick and easy to find USB ports in the dark or at night Aluminum Alloy Materialquick charge 3.0 USB car charger made of aluminum alloy material, strong and sturdy, which will not be overheating at high temperatures, non-flammable, good stability and more safer Easy InstallationThis USB 12 volt outlet easy to be installed. "+" to positive pole, "-" to negative pole. Car charger with IP66 waterproof grade, water and dust resistance. Certificated by CE and RoHS Broad CompatibilityThe QC3.0 12 volt USB outlet fits for 12/24V car, boat, marine, motorcycle, ATV, RV etc. Suitable for charging mobile phone(Note: iPhone series does not support fast charging, it is normal speed ), GPS, digital camera and other USB accessories etc.