Technics RP 350SE Electret condenser
Battery powered cardioid electret condenser microphone. It is transformer-balanced and wired for balanced 600 ohm use with XLR output.* It feels light and flimsy and very much like a consumer or home video microphone, but sounds surprisingly good.
It runs on 1 x AA battery.
(*In fact this came into the workshop wired unbalanced from the factory, but I noticed that it had an output transformer, so it was very easy to change to balanced output.)