AIPHONE GF-4P Door Station, 2 Conductors. More details: Door Station, Indoor/Outdoor, Height (In.) 3-3/4, Width (In.) 4-5/16, Depth (In.) 4-1/4, Door Station Height (In.) 3-3/4, Door Station Width (In.) 4-5/16, Door Station Depth (In.) 4-1/4, Master Depth (In.) 3-3/4, Master Height (In.) 4-5/16, Master Width (In.) 4-1/4, Distance (Ft.) @ 18AWG 980, Distance (Ft.) @ 22AWG 490, Wiring Conductors 2 Conductors, Wire Type Non-Shielded, Power Source Internal, Voltage 24VDC, For Use With GF Series, Includes Mounting Hardware