Sell wired and wireless video and audio door phone

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As for wireless video door phone, its description is as following:
Compact design, special outside aspect
Built-in high- capability switcher steady power
Wireless signal receiving and launching, high anti-interfere
Inter-phone wireless monitor, digital display, operate with humanly key board
Adopt special address code technology, prevent the interfere from other signal
Infra-red light, high-resolution display
Distance: More than 100m in open air
Set 20 talk channels, 4 monitor channels, talk monitor can be reset
Do not need wiring, easy installation