The CDR1 and CDR1F are the remote control panels for use with  the Cloud DCM-1 Digitally Controlled Mixer. They are fitted with the  same alphanumeric display as the DCM-1, menu navigation being by five  push buttons. When installed in one of the DCM-1's zones, it provides  the user and installer with more convenient and practical control of  systemoperation than from the DCM-1's front panel.
A zone may have one CDR1 (or CDR1F), more than one, or none at all.  Functions include selection of audio source and control of audio level;  additionally, any enabled zone groups of which the zone is a member may  be activated locally.