The Beyerdynamic Quinta MU 31 delegate microphone unit is equipped with a microphone button in the housing with which the participant can switch his microphone on and off. Additionally the unit features two buttons to adjust the level on the headphone output. The Revoluto microphone array technology with integrated microphone capsules provides a so-called corridor characteristic which ensures a wide range of good voice quality. The speaker can move freely, i.e. can stand up or sit down, can move his/her head and move towards or away from the microphone unit. The ready-to-talk status of the microphone is indicated by the red LED strips on both sides of the housing.