20 Minutes of Digital record time Call Screening/Intercept Memo Remote Access with Programmable Options Time/Day Stamp Memory Loss Protection 2 Data Ports 200 Name / Number Caller ID History 200 Name/Number Directory Auto Attendant Auto Redial & Last 6 Number Redial Chain Dialing & Programmable Pause Digital Receiver, Speakerphone, & Headset Volume Control Do Not Disturb Headset Compatible Rapid Scroll Selectable Ringer Tones 1 to 4 Line Capability 3 Party Conferencing 32 Speed Dial and 16 Intercom Number Locations 4-Line Caller ID/Call Waiting Capability 4-Line Lighted Display Auto Line Selection Expandable to 16 Stations Mix & Match with AT&T Models 945 and 974 Page, Intercom and Call Transfer between Stations Power Failure Operation for all 4 Lines(Requires a Charged 9V Battery)