The BWI-AS237 is a 45W USB type C model that can fast charge at up to 20V ( when connected in 24V system), the powerful 45W rating allows it to not only charges your iPhone iPads, but also ultrabooks, MacBooks…etc.
The PD chargers are not only carefully designed to ensure the compatibility but also let you know clearly whether you are charging at high speed. Normally it is blue LED (staying by or charging at 5V), and when it is in PD fast charging mode, it becomes Orange LED.