The VTech CS6719-2 Cordless Phone with Caller ID features an
expandable system in which you can add up to five additional handsets
(uses CS6709). This phone set includes a backlit keypad and display for
easy viewing, ECO mode power-conserving technology and a quiet mode that
silences the ringer to prevent interruptions. The VTech phone system
with call waiting has caller ID, a full duplex handset with speakerphone
and an indicator that notifies you of an awaiting voicemail