When the discussion machine is set to the chairman machine, the dcn-disbcm chairman button should be used to replace the original set of a single microphone button. This button can also be used for discussion machines in auxiliary control mode. Technical specifications mechanical indicator mounting card mounted on the discussion machine color silver white (RAL 9022) order information dcn-disbcm chairman button (10) new generation DCN system meeting discussion device chairman button (10). Order number DCN - DISBCM