This dual QC3.0 USB ports car charger can simultaneously charge two devices that support the QC3.0 protocol at QC3.0 speed. The fast car charger total power 36W, maximum output of each port up to 18W. This fast car charger with colorful voltmeter & ON/OFF switch. When dual QC3.0 port not connected to mobile devices, the colorful voltmeter will always display the voltage value of the car battery in real time. Touch ON/OFF switch lightly, LED light will stop flashing and turning. At this time, the red indicator light is on, and dual QC3.0 ports still charge mobile devices. Long press the switch about two seconds, both colorful voltmeter & QC3.0 port power turn off, car charger in non-working state. This universal Car charger is made of high temperature and low temperature resistant materials. Built-in intelligent control chip and 10A fuse. Quickly identify charging devices in one second. This car chgarge provides the fastest possible charging for all non-fast charging devices.