I think that's just a regular synth. MIDI keyboards are keyboards that you plug into other synths that are used as a trigger. You can use regular synths as triggers as well, but you can do more with regular synths than MIDI keyboards (by themselves at least.)
I've looked around, and everything I've read has emphasized the need to read the manual (sorry

). You could try seaching around Ebay for it, or look on the internet. Aside from that. I don't know what else to say.