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Product DescriptionFeature: With micro-processing technology, auto-remote control, excellent performance and high reliability The TFT 7 inch digital color LCD for monitor Clear night viewing 24 hours monitoring, calling, speaking and unlocking remote controlling etc Additional monitor available up to 6(optional) and 4 outdoor cameras at most TFT color screen with low power consumption, no radiation and high definition Hands-free intercommunication Brightness, chroma and volume adjustable 25-chord melody rings for option Cabling: 4 -core connection cable Do not disturb mode Specification Indoor Unit