RCA Unison Expandable Corded Telephone System 4-line phone base station that is expandable to up to 10 phones. Compatible with RCA Unison wireless deskset and cordless handset options. DECT 6.0 technology provides clear, digital calls. Each extension has full access to 4 lines, 6-way conferencing, call transfer, intercom, caller ID, call waiting, full-duplex speakerphone, 99 entry phonebook, and 30-speed dials. Features customizable hold music, digital answering system with a mailbox for each extension up to 200 minutes total record time , remote access, and a digital receptionist to help route calls. Station status indication, call forwarding, large and easy to read display, 9 extension status indicators, 200-name number directory, one-touch voicemail access key, Do Not Disturb setting, incoming/outgoing call logs, and custom ring tones. 2-year warranty. Type Corded, Number of Lines 4-Line, Color Black, Number of Handsets 1 Handset, Dimensions 9 W x 7 H x 7 D, Weight 2-1/2 lb, Pkg Qty 1, Package Type Box