The VTech CS6719-16 Cordless Phone with Caller ID features an expandable system in which you can add up to five additional handsets. 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. VTech CS6719-15 Cordless Phone with Caller ID: DECT 6.0 technology Caller ID/call waiting Full Duplex handset speakerphone Backlit keypad and display Expandable system up to 5 handsets ECO mode power-conserving technology Quiet Mode silences ringer 50-name and -number phonebook directory and caller ID history Intercom between handsets Conference between an outside line and up to 2 cordless handsets Voicemail waiting indicator English/Spanish/French setup menu Table- and wall-mountable Flash Last 10 number redial Mute and volume control