This isn't a normal audio body for the capsule--it's part of a "wireless" microphone system for film and video sound recordists. In other words, it's a radio transmitter.
I've seen these on display at AES conventions for many years, have some literature on it around here somewhere, but don't know whether it's still in production or not. If anyone's seriously interested, I'll bet Jerry at Posthorn could tell them about it.
--best regards