You have a mic out on the receiver. So you need wired IEMs.
Discussion
That mic out only plays the recorded sound, right?
I need something for calls, so the audio should be sourced from the phone and play in the earbuds.
I don't know. Initially, I thought, why wouldn't it? I guess it makes sense not to, as this is intended for behind-the-camera monitoring. Still, you can use some of these wireless mics and bluetooth IEM together. What's the issue there? These receivers have an internal battery, so it will not put extra battery drain on the phone.
Android cannot split incoming mic from outgoing audio, so using such a plug in mic with Bluetooth headset isn't possible.
Oh, I see. Check this out. https://moondroplab.com/en/products/voyager
Moondrop makes superb IEMs, can't imagine their mics not being superb as well.
Interesting, Thanks!
I'm not a big fan of the neckband style though.