20 watts is good, because it supports fast charging, iphone12 buy a 20 watt charger, because its wired charging supports up to 20w, wireless charging supports up to 15w. The four models of the iPhone12 series will come with a Type-C Lightning port data cable, but will not come with a charging head, so if you want to charge the iPhone12 with 20w fast charge, you need to buy another Type-C fast charge that supports the PD protocol, you can choose to buy official accessories or third-party accessories.