VTech 1 handset DECT 6.0 silver/black expandable cordless phone with Caller ID and handset speakerphone. Expandable up to 5 handsets with CS5109 accessory handset. The full-duplex handset speakerphone allows both ends to speak and be heard at the same time. Caller ID entries display on a large, backlit LCD screen. DECT 6.0 gives you private, interference-free sound from any room in your home. Add up to four accessory handsets with just one phone jack.