video door phone product : outerdoor station material : stainless steel model :CS-200SV(B)-3 CS-200SV(C)-3 power source : DC 12Volt ( from indoor phone) camera : 1/4" B/W cmos or 1/4" B/W CCD for CS-200SV(B)-3 1/4" color cmos or 1/4" color CCD for CS-200SV(C)-3 lens : f=3.6mm minimum illumination : 0.1Lux light source : 6IR LED power consumption : 2.5W operating temperature: -10 to +50 installation : wall -mount wiring : 4wires / 2 wires 1 to 1 system or 1 to 4 system Function : one door station can up to four indoor phone surveillance intercom remote unlocking B/W or color are available LED in the door station providr a clear picture in the night connect with 4 wires or 2 wires picture memory ( choice) alarm deterrent