The VTech CS6719 Cordless Phone with Caller ID features the ability to be expanded on with the addition of five handsets (uses CS6709). The phone system includes a backlit keypad and display for easy viewing ECO mode pooer-conserving technology and a quiet mode that silences the ringer to prevent interruption. The VTech phone system with call waiting features a full-duplex handset with speakerphone and a voicemail indicator light for extra convenience.