DECT 6.0 technology; Makes & receives landline & cellular calls ; Expands up to 12 handsets (2 can be cordless headsets); HS speakerphone; Caller ID stores up to 50 calls; Full duplex handset speakerphone; ECO mode for conserving power; Up to 14-min record time; Message retrieval from handset; Multiple headset-wearing styles; Intercom between handsets & headset; Conference call between an outside line & up to 4 cordless handsets ; En/Sp/Fr trilingual prompts;