Electret condenser cardioid microphone; Indicator light on active microphone: when microphone is active, indicator light switches on
● Monitor speaker of desktop intercom, to monitoring the sound from windows microphone.
● Volume knob and on/off switch of monitor speaker for desktop intercom (with indicator).
● Volume knob and on/off switch of monitor speaker for windows intercom (with indicator).
● SPEAKER: Connection for window intercom, 3.5 mm