3.5 inch color video door phone/video indoor monitor/video indoor unit NSK7435CX monitor 3.5 inch color video door phoneNSK7435CX indoor monitorFunctionCalling,Talk,Monitoring,Remote control the lock.Applicationmatch to all of the CX and NCX outdoor unitHousingABS materialScreen3.5"TFT LCDAdjustmentsvolume,brightness,contrast,saturationInstallation methodsurface mountingMemory module(optional) ...