Ah, ok, the part about having the battery box was what I was thinking would be more likely. I don't really have the budget to buy a Hi-MD unit though and I don't mind simply recording it back onto the computer, analog style (i would primarily be using this for field recording). Would the model I linked to be a fair compromise, given that i can't spend much? The specs on this page seem to indicate that it has a mic-in http://www.minidisc.org/part_Sony_MZ-R90+R91.html