OK I had a quick chat with Mike and he was very helpful as usual (I love this company

).
The MPS-1 plugs directly into
any BP25, even the old ones that came with the AC supply. The MPS-1 is not necessarily plug & play with any BP20 however.
So Werd: I wonder can we make a deal for your MPS-1? Maybe I have something you might want to trade for? Send me a PM.