The ICS-1016E has 30 talk/listen buttons with 2 clear buttons. Key Features: • Back-lit, bi-color LED buttons illuminate at different levels to indicate conditions • Individually programmable buttons can be designated as talk, listen, or talk with listen • Individually adjustable listen levels • Momentary/latching buttons can be individually programed as momentary only • Answer-back button • Call-waiting tallies • Controls for sidetone, microphone gains, page override, and speaker mute • Programming via a configuration computer or the ICS-2003E Master Intercom Panel.