i purchased about 25 board cameras at an auction,some are dual board,some are wireless.the wireless ones I've gotten figured out but there are 4-5 that look a lot more expensive,all of these are dual board,these came with bnc connections as well as power supplies,problem is there are ac adapters as well as ac/dc adapters,how can i no which goes with witch cam?i have pics but haven't Been able to figure out how to upload here.if someone would like to offer advice,i'd gladly e-mail pics.last thing i wanna do is destroy something when someone may have useful info. i ask this before,how do i determine manufacture,model ect. i've looked at everything under a magnifying glass,found nothing other than as series of #s,seems like 3 might have same #s and 1 is different,the cam that has diff. #s even looks different,never seen anything like it.i believe these 4-5 cams were used by wal mart security,they have high dollar lenses ect,sees in total darkness without use of any type light source.sense there is 1 ac power supply,i assume 1 cam is ac,but which one i have no idea.thanks for your time.