Standard M4 Microphone 4 pin

Specifications:
Type Omni-directional dynamic
Sensitivity -70dB +/- 4dB
Impedance 600 ohm at 1 KHz
Frequency Response 150 - 3000 Hz
Cable 7ft curly rubberised cable (3 core + 1 shield)

4 PIN Plug

wired = Midland