Four-line SynJ® system base is expandable up to ten handsets or desksets. Includes a separate mailbox and auto-attendant voicemail on each line. The large backlit display on the base and each handset is easy to read. Features three-way calling, speed dial, redial, mute, hold, selectable ring tones and remote access.Package Includes: Line Cord; (2) AC Adapters; (2) Battery Packs; User Documentation