Image Sensor:1/2.8 progressive scan CMOS;Max. Resolution:2560 X 1440;Zoom:25x optical, 16x digital;Focal Length:4.8 mm to 120 mm;Supplement Light Range:500 m IR distance;Alarm:1 input, 1 output;Model 1:DS-2DF8C442IXS-AEL(T5);Model 2:DS-2DF8C442IXS-AELW(