Mmcx to 2 pin .78mm I think that's a wise choice.

It's mmcx to 2 pin. Since I'm inpatient I immediately bought the mmcx version of the UTWS3 even though most of my IEMS are 2 pin. But my favorite as of the moment is the FH3 which has a mmcx connector.

Here's the side by side comparison with the previous version UTWS1, the main body where the battery and controls are a bit longer on the old UTWS1 on the other hand the UTWS3 ear hook is thicker and a little bit longer I think🤔. Comfort wise the UTWS3 is a lot more comfortable and easier to fit...

Yes bro, this forum has been very helpful on our chosen hobby.

Just got them an hour ago and yes they are really really a big improvement over the UTWS1, comfort, sound output, generally a better experience.

I'm not really sure, but I have read that it's better to buy the mmcx then get a OE adapter for 2 pin due to some fitting issues in some IEMS with recessed 2 pin connections. But I do hope everything works out for yah.

I do believe that the UTWS3 at the moment is undeniably the best option for a using your favorite IEMs as a TWS. It aint perfect but give fiio a year or two then surely we'll see something near perfect. Be expecting my set tomorrow.