Merlin BIS-22D 3166-DSB
22 Buttons with LED indicators for line appearances, intercom, and programmable features
4 Fixed feature buttons with LED indicators: Message, Speakerphone, Handsfree Answer on Intercom, Microphone
Fixed feature buttons for Conference, Drop, Transfer, Hold and Recall
Another jack for a General Purpose Adapter or headset Adapter
Alphanumeric Display: Clock, Calendar, Call Timer, and Appointment Reminder Alarm.