Expand your existing phone system to increase functionality Requires the VTech CM18445 main console to operate (sold separately). Connect the power cord and push the registration button to pair to the main console. DECT 6.0 digital technology helps protect against wiretapping and provides excellent call range without interfering with wireless routers. 4-line capability for flexible options in your home or business. All 4 lines feature power failure operation and lighted line indicators. Digital answering system features up to 180 minutes of record time. Records incoming messages, outgoing announcements and memos. Features start, stop, skip, repeat, delete and delete all options. Call waiting/caller ID displays the name and number of incoming calls and remembers up to 50 callers for convenient callback. Call waiting/caller ID service required from your local telephone company. Built-in, full-duplex speakerphone allows for hands-free talking. 4-way conferencing lets you set up meetings over the phone. 32 speed dial buttons for making calls in an instant. Page, intercom and call transfer options simplify communication between stations. 100 name-and-number phonebook directory for keeping track of important numbers. VTech(R) DECT 6.0 Expansion Deskset For VTech Small Business Main Console, CM18245 is one of many VoIP Systems available through Office Depot. Made by VTech.