Ref : PIO 511. It mutes the microphone while listening, and lets the audio transmission through when pressed.
Particularly well suited to refereeing constraints, useful for the 4th official or linesman, for example.
Supplied with a generic earphone kit: left and right earpieces and 3 silicone inserts.
Also available with a molded ear impression.
No pressure around the head and no discomfort: total freedom
Excellent speech intelligibility: crystal-clear sound