DECT 6.0 Digital technology. Caller ID/Call Waiting. Handset speakerphone. Backlit keypad and display. Expandable system up to 5 handsets (uses CS6609 accessory handset). ECO Mode power-conserving technology. Quiet Mode silences the ringers. 50 name and number phonebook directory. 50 name and number Caller ID history. Intercom between handset and base unit. Conference between an outside line and up to 4 cordless handsets. Voicemail Waiting Indicator. English/Spanish/French setup menu Cordless Phone System with Caller ID/Call Waiting. Table- and wall-mountable.