Expandable to 10 handsets; Without answering machine; Full duplex speakerphone; Call Waiting/Caller ID with 99 name/number log; Redial with 3-number memory; 10 programmable 1-touch speed dials; 99 name/number directory; 3-way conferencing; Intercom with Page All feature; Privacy/Do Not Disturb; Headset jack; Visual line status indicators; Auto line select; Dual key pad; Desk or wall mountable; Digital volume control; Hearing aid compatible; Trilingual LCD displays;