... video image, auto image and alarm 420/480/520 line, 0.5LUX, 1/3 SONY CCD night vision 50m ... update function* Bi-directional real time transmission of audio talk-back * Network self-adapting technology to adjust video frame rate ... :Image Sensor 42S/42SN 420 line, 0.5LUX,1/3 SONY CCD48S/50SN 480 line, 0.5LUX,1/3 SONY ... Super HAD CCD52S/52SN 520 line, 0.5LUX,1/3 SONY Super HAD CCDInfrared Light ...