I have a switch that has poe. I was under the false impression that all POE units were 12 volt. I was about to attach a cam to my switch and received an error having to do with possible over voltage. I did a little research and determined that mine puts out 24 volts. I would have fried my camera if I had hooked it up. Many listings on Amazon do not list a voltage. I find that hard to believe. I also find very few that are 12 volts. Am I missing something here? Maybe the cams have a voltage regulator in them? What brand or model number is a good on e for 8 poe cameras? Must be priced lower that $140.