VTech 5831 5.8 GHz DSS Expandable Cordless Speakerphone with Caller ID/Call Waiting 5.8 GHz digital spread spectrum technology Expandable to 6 handsets, 1 included; dual keypads Speakerphone in handset and base; remote charger stand Supports caller ID with call waiting 50 name-and-number caller ID memory and phonebook directory