Electret condenser microphone, unidirectional, impedance 600 ohms, and Japanese design!
It is marked on the box! : D
At least we know now what we're dealing!
2 positions: vocals and microphone.

Power is supplied by a battery of 1.5 V (no phantom power at the time it seems to me)

OVERALL OPINION

I use it for about a year of song only. I've never done making
on his instrument with currently.
For voice, it makes quite accurately the tone of the singer. Its appearance seems old now, but I do not care, it does very well so it is designed.
The output level is still very weak and lacks dynamics. proximity effect seems to me quite "fuzzy".
However, he's a very hot.
Not many with the microphones serious, very responsible in medium, we get a voice clear and intelligible.