1.QC4.0 is only available in type c to type c port and need QC4.0 supported Cable, USB port just support QC3.0.
2.When charging two devices,it will be like normal charger
Baseus 30W USB Type C Quick Charge QC 4.0 Car Charger For iPhone Samsung AFC Huawei SCP FCP Dual USB Type C PD Quick Charge QC 3.0 Fast Car Phone Charger
Specification: Baseus 30W Quick Charge 4.0 3.0 USB C Car Charger For Mobile Phones
40 reviews for Baseus 30W Quick Charge 4.0 3.0 USB C Car Charger For Mobile Phones