The DP-RA01 is a legacy audio intercom system, often succeeded by newer models like the DP-LA01M . Its primary purpose is to facilitate secure communication between a building entrance and up to two internal rooms.
Search for https://www.commax.com/download/manual/dpra01_install.pdf (or similar old structure) on archive.org . Many older Commax manuals are preserved there. commax dpra01 installation manual link
Hang the DP-RA01 onto the bracket hooks and slide it down to lock it in place. ⚠️ Important Safety Precautions The DP-RA01 is a legacy audio intercom system,