Memory Loss Protection, 2 Data Ports,Auto Redial & Last 6 Number Redial,Chain Dialing & Programmable Pause,Digital Receiver, Speakerphone, & Headset Volume Control,Do Not Disturb, Headset Compatible, Hearing Aid compatible,Hold,Rapid Scroll,Selectable Ringer Tones,1 to 4 Line Capability,3 Party Conferencing 32 Speed Dial and 16 Intercom Number Locations,4-Line Lighted Display,Auto Line Selection,Expandable to 16 Stations,Mix & Match with AT&T Models 974 and 984,Page, Intercom and Call Transfer between Stations,Power Failure Operation for all 4 Lines(Requires a Charged 9V Battery)