QUICK CHARGE 3.0: Designed with USB outlet and TYPE-C port supporting QC 3.0 car charger adapter to charge 2 devices simultaneously up to 4 times faster than conventional charging. Max single output is 18W(USB)and 46W(TYPE-C).Compatible with Quick Charge 2.0 and 1.0. LED DIGITAL DISPLAY VOLTMETER: The built-in intelligent voltmeter with blue LED digital display shows you the real-time voltage status of the battery or the alternator, prevent your motorcycle or car from starting hard, more secure for driving. SAFE PROTECTION: The over current and short circuit protection of this car charger socket ensure charging safety.Made of heat-resistant and wear-resistant aluminum alloy, non-flammable, good stability and more safer.The tight fitted cap over the USB interface displays the voltage readings as well as effectively protects the charger against water and sudden splashes Easy Installation: This USB 12 volt outlet easy to be installed. "+" to positive pole, "-" to ne