Four-line SynJ system base is expandable up to ten handsets or desksets. Includes a separate mailbox & auto-attendant voicemail on each line. The large backlit display on the base & each handset is easy to read. Features three-way calling, speed dial, redial, mute, hold, selectable ring tones & remote access. Answering System: Digital; Lines: 4; Telephone Type: Corded; Cordless; Caller ID / Type: Base; Handset.