The Hollyland Lark M2 was already a small, high-quality wireless microphone you could get for the iPhone, but now its M2S successor is even more tiny.

Hollyland Lark M2S receiver and two wireless microphones

Hollyland Lark M2S receiver and two wireless microphones
This is why I review products instead of trying to make them — the new Hollyland Lark M2S takes something I was delighted with and makes it so much better. I bought the now-old Hollyland Lark M2 and have been using it extensively for a year, but now I won’t touch it because the new edition solves issues I hadn’t even realized were there.
Both models are still available. Both are wireless microphones with optional accessories for pairing them to an iPhone or a camera.