PK900-816H 1/4″SONY CCD,480TVL0.7LUX 16 time optical zoom PK900-822H 1/4″SONY CCD, 480TVL0.01LUX 22 time optical zoom PK900-827H 1/4″SONY CCD, 480TVL0.01LUX 27 time optical zoom PK900-822HP 1/4″SONY CCD, 480TVL COLOR 0.5LUX switching to B&W 0.01LUX 22 time color switching to B&W Incorporate PK900-827HP 1/4″SONY CCD, 480TVL COLOR 0.5LUX switching to B&W 0.01LUX 27 time color switching to B&W Incorporate PK900-822HSP 1/4″SONY CCD, 480TVL220 time ,10 time electronic enlarge ,automatic focused and Infrared Incorporate ,the Infrared effective range are 100-120 meters. PK900-827HSP 1/4″SONY CCD, 480TVL270 time,12 time electronic enlarge, automatic focused and Infrared Incorporate ,the Infrared effective range are 100 meters.