CS6619-2 Cordless Phone System, Base and 1 Additional Handset, Black/Silver. With the touch of a button, the speakerphone in each handset makes hands-free conversations easy. Silence the ringer on the handset and base unit immediately or for an extended period of time. Power-conserving technology that manages consumption for optimDECT 6.0 Digital Technology.Caller ID/Call Waiting.Handset speakerphones.Backlit keypad and display.Expandable system up to five handsets.ECO Mode power-conserving technology.Quiet Mode silences the ringers.Fifty name and number phonebook directory.Fifty name and number Caller ID history.Intercom between handset and base unit.