I was given this scoring box a couple of years ago. I am told it functions- I am hoping to set it up in our club as a simple touch indicator for our kids epee classes. There is no logo or makers marks on it anywhere. It is mounted inside a Pelican Box. I figured I would post it here and seek the wisdom of the crowd. My questions: - Any idea who manufactured this? - I need a power cord/supply. I'm no electrical engineer but I see that the power input is a XLR audio jack (see photo). I figure I can rig something by re-wiring an old power supply cord but I don't know how to determine what the voltage / power requirements are and I don't want to fry it (or myself). How do I figure this out? Any help would be appreciated. Many thanks in advance.