Eircom advantage 4800 System Introduction page 20

Executive System Phone
Simple 2-Wire connection
Full hands free operation
6 Feature keys
16 Programmable function keys
20 Character by 4-line, back lit LCD display
Context sensitive programming keys
Wall mountable
Headset socket.
Executive system phone DSS Module
48 Programmable function keys with associated LEDS
Simple connection to executive system phone
Standard System Phone
Simple 2-Wire connection
Full hands free operation
6 Feature Keys
16 Character, back lit single line display
Wall mountable