With the Classis RM 31 RC you can select via the programmable button between the operating modes ON/OFF, Push-To-Talk and Push-To- Mute. The microphone button can also be disabled. The frequency response can be set with a separate switch in two stages: Linear or with low-cut filter to suppress low-frequency interference. The illuminated ring indicating the microphone status can be deactivated. In addition the Classis RM 31 RC provides the option of external control. Furthermore, when operating the microphone button, an external device can be controlled via the control output. The LED ring displays the ready-totalk status of the microphone.