Millet 20 watt wireless car charger does not necessarily support Apple fast charge, of course, it can support the ordinary charging speed, so you can try, try to try its charging speed, I think wireless car charger is still a bit of a waste, it is better to plug directly into the power directly charging to speed up a bit, but wireless charging is just an intermediary device.
Yes, the device supports charging the iPhone, and it can use the iPhone's fast charge