Vodavi Starplus STS SP-3560-08 Door Phone (White/Refurbished)Door Phone designed to work on the StarPlus STS and StarPlus STS Home. Key Features: Mfr. Part #: 3560 08 Connection via a station port Two way hands free voice communication Volume control to adjust speaker Custom ring for doorbox Handsfree ICM no push to talk Half Duplex speakerphone LED activation light to indicate activation of door phone Two external contacts that allows a remote call button (doorbell) to be wired to a doorbox, once the doorbell