Four-line Corded Business System Phone is expandable up to 16 extensions. Features page, intercom and call transfer between stations, 32 speed dial and 16 intercom number locations, three-party conferencing, speakerphone in base and handset, chain dialing, rapid scroll, four-line blue backlit display, memory loss protection, auto line selection, hold, line status, Do Not Disturb feature, auto redial, last six number redial, mute, two data ports, power failure operation on all four lines, flash and selectable ring tones. Setup Menu can be displayed in English, Spanish and French. DSL compatible. Hearing aid compatible. 2.5mm headset compatible. Expandable to 16 Stations with AT&T Models 1040, 1070 and 1080.