Genuine Original Nortel Meridian M3900 Series Key-Based Expansion Module With Footstand NTMN37BA70. The Nortel M3900 Key-based Add-on Module is a fully dedicated unit that is attached to a M3900 series phone. This module is built to supply phones with an additional 22 programmable buttons with busy lamp field indicators.

Part Number: NTMN37BA70
Compatible Part Numbers: NTMN665070
Compatible Models: Nortel Meridian M3900 Series







Features:

- Adds on 22 buttons
- Busy lamp field indicators
- Two add-ons are supported per phone