Functions:	outdoor station
	bidirectional communication
	Audio/video communication
	call the indoor monitor
	unlock the door
Data of technology	image device: 1/3' ' CCD camera with night vision
	Working voltage: 15V
	Working current: < 180mA
	Wiring: 4 wires
	Scene Illumination: 0.1 Lux (300mm from the camera)
	Scanning Frequency: Horizontal: 15.75KHz Vertical: 60Hz
	Ambient Humidity: 45%~95%
	Ambient Temperature: -10oC-+40oC
	Video Signal: 1Vp-p 75Ω, PAL or NTSC