Let’s get to the meat of this unit: its features. In short, it’s special because it gives you access to the Godox ecosystem. The flash itself is much like any other hotshoe offering of its size; It's slightly less powerful than the flagship offerings from the big manufacturers. However, you get a built-in Godox 2.4 Ghz transceiver. Before we get to that though, let’s take a look at the other features the unit offers. The Standard Fare

Please downgrade the flash power output. If the flash is in TTL mode, please try to change it to M mode(a preflash is needed in TTL mode).Looks like some of you know a lot about Godox flashes. I have a question. I already own the XPro trigger and a TT350F on a Fuji X-t2. I would like to have a second flash to experiment with portraits. Question is if I get the TT685 and try to use TTL will the two flashes be comparably equal in output or will the more powerful TT685 always put out more light when using two flashes in TTL. Saying it another way is will the TT685 act like the TT350 when used together?

This is not yet the case with Fuji, it often misses a trigger. And at first, you might think that the flashes have long recycle times, but this is not the case with my Sony system either. So what is going on here? I would guess that we need a new firmware upgrade before the system will be suited for professional use. Conclusion Now press the SLAVE button to choose either A/B/C or M groups and press mode to select TTL or manual mode (or turn this group OFF). Tip: set it to TTL to start with, it’s the easiest way to use the system.

https://www.sritch.com/fuji/fujifilm-xpro2-hss-ttl.html Look at the blinds on the right of the images to see the effect of the hss. The images include the important exif info.