The basic V-2924A Talkback Intercom System provides 24 stations with one-way, two-way, group call and all call pages.
The V-2925A Expansion Unit is an add on unit for the V-2924A.
Each V-2925A Expansion Unit will expand the V-2924A by twenty-four (24) additional stations.
Up to three (3) Expansion Units can be added to a system for a total of 48, 72, or 96 zones of paging.
The V-2925A can ONLY be used with the V-2924A.