Call Entrance Station Indoor/Outdoor 4 Call Height (In.) 6 7/8 in Width (In.) 3 15/16 in Depth (In.) 4 1/4 in Door Station Height (In.) 6 7/8 in Door Station Width (In.) 3 15/16 in Door Station Depth (In.) 4 1/4 in Master Depth (In.) 6 7/8 in Master Height (In.) 3 15/16 in Master Width (In.) 4 1/4 in Distance (Ft.) @ 18AWG 1 020 ft Distance (Ft.) @ 22AWG 360 ft Wiring Conductors 2 Conductors Wire Type Non-Shielded Power Source 12V AC Voltage 15V AC For Use With DA Series