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.


  • Arbitration
  • VAR


Long-lasting comfort


No pressure around the head and no discomfort: total freedom

Crystal-clear sound

Excellent speech intelligibility: crystal-clear sound

Technical specifications

  • Microphone sensitivity: -44 (±4) dB re. 1V/Pa at 1 kHz
  • Microphone type: Electret, noise-cancelling
  • Ear speaker sensitivity: 94 dBA @ 150 mVRMS
  • Ear speaker impedance: 50 Ω DC, 100 Ω @ 1 kHz
  • Cable pulling force: 50 N
  • Operating temperature range : -20°C – +60°C
  • Electromagnetic compatibility (EMC) EN 55022, EN 55024