Catalog > Consumer Electronics > Security & Alarms > Access Control > Video Doorphones Commax 8 Button Entry Station 8 Button Entry Station CMX DR-8UM Commax DR-8UM 8 Button Entry Station Call for Price Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features 8 button Wide Name PlateMaterial : AluminumHouse Call and Talk Specifications Power Source : DC 12VData Transmission : 3 Wire in Common +1 WireCommunication : Hands-Free TypeDisplay Device : Led LightDimension(mm) : 130(W)×315(h)×10(d)Installation Hole Size : 110(W)×284(h)(mm)Fillupbox Size(mm) : 122(W)×305(H)×37(D)