conference system(discussion system) Open mode with auto switch-off. To select the maximum number of conference delegate microphones to be activated simultaneously (1, 2, 3 or 4). The conference microphone automatically switches off if the speaker does not speak for 30 seconds. The microphone can manually be switched off by pushing the button on the conference delegate unit. Open mode. To select the maximum number of conference delegate microphones to be activated simultaneously (1, 2, 3 or 4). The microphone must be switched on or off manually by pushing the button on the conference delegate unit. Override mode. Only one conference delegate microphone can be activated. If a new conference delegate presses his conference microphone button, the conference microphone unit of the current speaker will be switched off. Chairman only mode. Only the chairman units can be activated. Test mode. For proper installation check. All the lighting and LEDs of the connected units will lit, if properly connected. conference system conference system conference system conference system