Sony ECM-MS957 M/S Stereo Microphone

Awesome mid-side stereo condenser microphone with built in processor.
It's powered by a AA battery, and includes a 5-pin stereo xlr to 1/16th TRS and an extra 5 pin to 5 pin stereo XLR so you can break out of it into mono xlr's from that ( breakout left and right cable not included). 

What's cool is that it does the mid-side processing and then breaks that out via cable.  These where meant for sony mini-disc recorders, and many many a live bootleg were recorded with them!

A bit of cosmetic wear, but works great! These are hard to find not super beat up.