The Display-Based Expansion Module adds 8 self-labeling (LCD) "soft keys" in 3 "pages" (or "layers"), for a total of 24 additional lines or features. Fixed paging key for navigating between pages.
For the M3904 and M3905 telephones. One year warranty.
Part Numbers: NTMN67, NTMN67AA66, NTMN67AA70, NTMN67AA, NTMN67AC66, NTMN67AC70