Question about Belkin BoostCharge 3-in-1

I charge my Ultra on this device and it works without any problems.

if you own the 49 mm Ultra do not buy this product. the watch is too large to fit on the stand and will not charge properly

Hello, as I have owned several Apple Watches and charging has not changed in any way, I cannot imagine that a separate charger is needed for the Ultra. As far as I know, the main difference to the normal Watch is the titanium case.