Please don't ask me anything about it besides how big it is. I don't know the other things. Answer I do know: pretty big. Works. You'll hear things out of it.
Edited to add: I was told by people who know that this is worth $300-600. Friend says, "Looks like a Yorkville Sound NX Series 300-watt Powered 15 + 1 inch PA speaker."
Lots of other things for sale or free.