Radio Alarm System Transceiver Options Monaco has two categories of Radio Alarm System Transceivers which provide flexibility for zone alarm and trouble reporting to our central receiving systems. The FSK Transceivers communicate with Monaco's D-700 Radio Alarm System, the D-700/500 Radio Alarm System and the D-21 Fire Management System. The DTMF Transceivers communicate with Monaco's D-500 and the D-21 Fire Management System. See the Addressable Products section of our Web Site for information on our M-2 and M-1 Analog Addressable Panels.