Uniden TRU9380 5.8GHz Expandable Cordless Phone System with Digital Answering System and Call Waiting/Caller Id 5.8 GHz Digital Spread Spectrum (FHSS) or frequency hopping technology secures caller privacy while providing a long range of crystal clear sound. 70-Name phonebook and 30-number Caller ID memory Handset speakerphone Bilingual menus Personal ring feature