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- BT Meridian M3904 Dba Add-on Refurb Blk
The Display-based Access Expansion Module provides additional line (DN) or feature keys for the M3904 or M3905 telephone. The DBA has eight keys on three layers for a total of 24 additional DN or feature keys. The three layers are accessed through the use of a Page key. The M3904 or M3905 supports one DBA module.