Camera was set up to AHD already, if you need change AHD to TVI or CVI, you can change on your DVR. But your DVR should support AHD, otherwise Camera will not work. 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. Wide view angle lens, and the lens can be adjusted. Material and Item Dimention: plastic housing, Item Dimention: 0.39X0.39X2.36 inch Resolution: 2000TVL, 2MP, DC 12V 1A.