Pre 2019 all RVM-700 Monitors were suitable for use with analogue cameras only, during 2019 AHD variants that were compatible with all camera types were introduced.
From the start of 2021 all RVM-700A models have been AHD versions, and middle of 2021 all RVM-700B have been AHD versions.
To confirm which version you have please provide us with your serial number as there is no other obvious way apart form an AHD decal to identify the different variants