The Model BD3BN Intercom Door Station with Bell Button is a voice communications interface that mounts adjacent to a primary entry door. This model is compatible with the dmc1 and dmc3-4 Music/Communication Systems. Pressing the lighted bell button triggers the doorbell chime on the Music/Communications system to announce a visitor. Two-way voice communication with the resident occurs through the units built-in speaker. The faceplate of the BD3BN Intercom Door Station with Bell Button has a bright brass finish. The door station mounts recessed in the wall using a Model ME3 Door Station Rough-in Enclosure.