Features: TWO WIRES CONNECTION, NO POLARITY 1) Calling, dual talking, monitoring and unlocking 2) Al-alloyed door station & super thin handfree monitor 3) Two kinds of colour of monitor case (black and white)for choice 4) Two kinds of camera (CCD and CMOS) optional Specifications (outdoor camera): 1) Resolution: CCD 420 TV Line, CMOS 380 TV Line 2) View angle: CCD 92° , CMOS 78° 3) Lowest luminance: 0.02Lux 4) Appearance size(H x W x D): 200 x 130 x 40mm 5) Mounting size(H x W x D): 185 x 110 x 35mm Specifications (indoor monitor): 1) Display screen: 5.8" / 7" TFT LCD 2) Screen ratio of length and width: 16: 9 3) Talking way: Handsfree 4) Power consumption: Standby 0.5W, Operation 10.5W 5) Appearance size(H x W x D): 192 x 140 x 30mm