AHD/CVI/TVI/CVBS 4 IN 11/2.7'', V30+F02, 2.1MP/1080P, low illumination, with IRCUT, DNR, OSD Cable; Lens: 3.6mm; IR LED: Ф5*24pcs; Meter: 20m*CE, FCC, ROHS ApprovedAn IR-cut filter. IR light is filtered out so that it does not distort the colours of images as the human eye sees them. When the camera is in night mode, the IR-Cut filter is removed, which allows the camera's light sensitivity to reach down to low lux levels! DNR is a technique of removing image noise from a video signal by applying a digital comb filter. It makes images clearer and reduces video file size.CE marking is a certification mark that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA)the FCC mark is a certification mark employed on electronic products manufactured or sold in the United States which certifies that the electromagnetic interference from the device is under limits approved by the Federal Communications Commission.RoHS stands for Restriction of Hazardous Substances