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
LED Digital Display Car Charger
1.The artwork of vehicle charging industry
2.Coexistence of beauty and strength
1.Dual ports support quick charging
2.45W high power
USB Output : 4.5V/5A;5V/4.5A;9V/3A,12V/3A,20V/2.25A