VTech 00-2421 2.4 GHz DSS Expandable Cordless Phone with Dual Handsets and Caller ID 2.4 GHz DSS multi-handset cordless phone system Call waiting, caller ID, and handset speakerphone 50 name and number caller ID memory and phonebook directory Expandable up to 4 handsets; headset compatible Programmable ringer types; conference call capability