Spec Sheet Preview: Dimensions: 3.95” H x 6.30” W x .90” D (101mm x 161mm x 23mm) Connects via WiFi or supplied RJ45 jack/connector Power: 18VDC from the supplied SS237 plug-in Power Supply Takes the place of one (1) indoor VM237 monitor unit Can relay calls from up to two door stations (only primary door camera can be viewed without receiving a call first)