Nortel Networks M3900 Key-based Expansion Module provides 22 keys for any combination of lines and features. The M3904 and M3905 each support up to two expansion modules, for a total of 44 additional keys. The Key-based Expansion Module is the perfect option for busy receptionists, administrators, and managers. Use with your Nortel M1 Option 11C PBX system. Compatible only with M3904 and M3905 Nortel Meridian digital phones. Requires either a single or double footstand (single footstand for one Key-based Expansion Module; double footstand for two Key-based Expansion Modules).
Can be added to the M3904 & M3905 phones
Provides 22 additional line/feature keys
Add up to 2 Key-Based Expansion Modules per phone for a maximum of 44 additional keys
Fully programmable
Each button shows status of other PBX extensions
LED indicators
View who is on the phone prior to transferring calls
Footstand not included