Hi all im new here. Im an LP supervisor at Shopko and am setting up some of my own cameras, i just got a panasonic wv-bl204 but it didnt come with a power supply. I would like to know where the best place to get one is and what i exactly need. it says it required 24v ac 60hz 3.5w. It also has a ground and numbered 1 and 2 connections for the power supply what are three for?