Mophie 15W Wireless Charging Stand Supports 7.5W Charging on iPhone 11 and 12 Models
Just because wireless chargers support 15W doesn't mean 15W is actually taken advantage of. The iPhone 11 and 12 Pro Max charges wirelessly mostly at 7.5W with the Mophie 15W Wireless Charging Stand.
The Mophie 15W Wireless Charging Stand advertises the Qi logo to indicate that it has been Qi certified.
The Mophie charger ships with its own AC power adapter and documentation.
The Mophie 15W Wireless Charging Stand states to support input of 24.7 watts (19 volts @ 1.3 amps) which you will need to connect to its own power adapter in order to keep it charged using 24.7 watts.
You will need to attach the charging stand to the charging base through the allocated slot before using the Mophie charger.