High resolution CCTV Door Phone

7 inch color indoor unit : Connects up to 2 door stations,1 master monitor and 3 extensions , Inbuilt flash memory along with micro SD card support, Auto & manual video/picture recording, 16 melodies for each door station, Ringtone volume & talking volume adjustable, Brightness, colour and contrast adjustable, Do not disturb function, Door lock release Hands free, Outdoor Unit : High resolution pinhole camera, Infrared LED for night vision, Water and dust resistant, Angular bracket , Compatible with electronic door lock.