Channel Vision's DP and IU Series integrates weather-resistant speaker/microphone, doorbell button, and wall plate into every unit.
The DP series plates measure 6-1/2" x 4-3/8" while the IU series plates measure 4-1/2" x 2-3/4"
The DP-xxxxP and the IU-xxxxP series are compatible with Panasonic telephone systems