AT&T 945 Features: Easy to install Paging, Intercom and Call Transfer Between Stations 1 to 4 Line Capability. Expandable up to a total of 16 stations. Once you have this station, you can add up to 15 more (sold separately) as your business grows. Each additional unit requires its own phone jack and AC power outlet. 32-number speed dial and 16 Intercom Memory. No more looking up numbers! System allows you to store up to 32 numbers in its "phone book" memory null so dialing frequently called numbers can be done quickly and easily. Chain Dialing Rapid Scroll Auto Line Selection Speakerphone lets you do two things at once! Carry on a conversation while working on the computer or looking for the file you're talking about. Headset and hearing-aid compatible Volume control on speakerphone, handset and headset. 3-party conferencing Paging Intercom Call transfer Hold/Mute/Flash Programmable pause. Selectable Ringer tones Do-not-disturb. 4 Line Large backlit LCD for easy viewing. Auto Redial Last 6 number redial Two data ports. Get three machines in one! The station's two auxiliary jacks allow you to plug in up to two external communication devices null so you can operate a fax, modem or answering machine via your phone. Battery backup. When the power goes out, battery backup allows all four phone lines to operate (battery sold separately). Memory loss protection saves your programming, directory entries so you don't lose them all when the power fails. Compatible with AT&T models 944, 955, 964, 974 and 984 Call Waiting/Caller ID service required from your local telephone company. Color: Titanium Blue Replaces ATT 944 *** DISCONTINUED ***