Port. headset 2circ., bin, eacj circ.in 1 ear
Two circuit, binaural, each circuit in one ear
Two circuit, binaural, each circuit in one ear
Two circuit, monaural, use both simultaneously
Single circuit with program input (IFB)
Single circuit, switchable A or B
Single circuit, miniature
Single circuit, electret or dynamic mic.
Talent Receiver (IFB)