... unit indoor, color CCD camera, with ID card reader Outdoor station: Metal panel, with water proofImage sensor: 1/4 inch color CCD cameraWith IR night visionMin illumination ... indoor units. Indoor unit : Features:Vogue and beautiful design3.5, 4, 5, 7, 8, inch color TFT LCDHands free indoor phoneTwangs music ... output PAL or NTSCCalling out, surveillance, open door, talking and door bell etc. function