I tried it on an iPhone XR, Airpod 2s, an apple watchs series 1, and an apple watch series 2 with no speed charge. It actually didn’t work at all on the apple watch series 1. I tried charging it for about 10-15 minutes. The charger caused the watch to heat up to a point that I didn’t want to leave it on for charge anymore.
https://www.amazon.com/Saferell-Qi-Certified-Breathing-Indicator-Compatible/dp/B08DTQ7BGF