The Yaesu MD-100A8X desk mic features a cardioid dynamic mic element. It features UP-DOWN tuning (on compatible Yaesu transceivers). There is a scan switch, a switch for PTT (push to talk) and also a lock feature. The frequency response is 100 to 5000 Hz. Sensitivity is -75dB (0 dB=1 V/0.1 Pascal). Impedance is 500 ohms unbalanced.