Funcitons:	Video/audio communication
	Monitor entrance
	Remote door release
	7'' color TFT LCD screen
	Inter-call with extended phone set
	Optional for extended camera or extended monitors.
	Optional extended panel for apartments more than 24 in a building.
data of technology	Working voltage: 110V~220V
	Working current: <400mA
	Wiring: 4wires
	Ambient Humidity: 45%~ 95%
	Resolution: 420(W)*380(H)
	Video Output: 15625Hz 1Vp-p 75Ω, PAL or NTSC
	Installation method: surface  mounting type