Yaesu MD-100A8X

The Yaesu MD-100A8X desk microphone uses a cardioid dynamic microphone element. It features an UP-DOWN tuning control (on compatible Yaesu transceivers), a scan switch, a switch for PTT (push to talk) and also a lock feature. On the bottom of the microphone base there is a High Emphasis switch and a Low Cut Switch. 
The microphone cable terminates to an Yaesu 8-pin microphone plug. Also contained in the box is a reversible coiled cord adaptor, which allows the microphone to be connected to a RJ-45 type modular, or a Yaesu 8-pin Mic plug.
This is a 500 ohm microphone that works well with the FT-747, FT-757GXII, FT-840, FT-847, FT-897, FT-857, FT-890, FT-897, FT-990, FT-1000 and FT-1000MPV.

Note: It does not work on some older Yaesu transceivers such as the FT-736R.