It consists of 2 small diaphragm microphones the back of each mic pivoted at a single point.
They sound omni with the usual treble emphasis when singing in front.
The connector is a rare 7 pin (oval pin arrangement, not circular).
The connection seems to be unbalanced by 2 independent cable lines each with 2 cables and screen. But only one of the cables on each line seems to be transmitting signal and the other cable does not and is not connected to ground so it does not seem to be connected anywhere to the capsule.
It can be bought at eBay for a low price especially if the seller forgets to write M in the title.
Measured impedance of one of the particular mics is about 700Ω and 800Ω on the other.
The sound is nice with no s problems.
For singing a gentle slope low cut filter might be needed to cut bass heaviness.
A Peiades filter of typically (810Ω,170mH) sounded very nice with male singing voice.
Such a filter was also connected after connecting the 2 capsules in series anti phase for noise canceling (see Lou Burroughs). It sounded very nice.
Mic sound nice too without any LC filter.
Mic has not been tried in stereo mode yet.
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