... and well service Dimensions: 255 *188 *40 Dots Video Intercom,intercom system, video intercomFEATURES: Network by bus mastering, digital communicationAdopt ... types mixed to Install, Embedded and wall-mountedMore functions: intercom, video, unlock, surveillance, alarm and so on.Able ... management center, more outdoor unit, free-hand indoor unit, audio indoor unitUpdate to the function of multi-way alarm ...