Camera was set up to AHD already if you need change AHD to TVI or CVI or CVBS you can change on your DVR But your DVR should be 1080P 4in1 AHDCVITVICVBS Working Condition Camera can work during daytime and night with light If under low light picture quality is not so good as the daytime Pls use DC 12V 1A Power Adapter for this mini camera Advantage AHD cameras resolution and picture quality is much better than analog cameras Material and Item Dimension plastic housing with microphone Item Dimension 039X039X236 inch Resolution 2000TVL 2MP Sony Sensor DC 12V f36mm screw pinhole lens