Oh, I got a few of these. Reserved.
I was trying to think of all the questions I want answered but you got most of them already. The ones I had were how it connects to the computer. Which kind of wire is it? How does the USB cable connect to the board? Do I have to buy the USB cable separately or does it come with the basic board purchase? Then I asked how it connects to my electrical item of choice. Which kind of wire is used for this? How does this wire connect to the board? Does it require a relay between the wire and electrical item? I think that's it. A basic diagram like the audio one you got me yesterday would help immensely. It would show people the kind of wires connected on both sides and how they go into the board.
EDIT - ha, now I can't delete my other post.