We got this one in the other day. A Japanese-built Cort double neck with a funky natural/stripey finish that can only have come from the twilight of the disco era. This thing is massive! A coffee table with strings! Actually, the weight and bulk aren't so bad, given that it's a doubleneck, and both necks are quite comfortable to play.
Opening up the back compartment for the 12-string side reveals a 9-volt battery, which means it has an active pickup system. I'm not entirely sure, though, if the active electronics are in both sides or just the 12-string side. In any case, both sets of pickups have a more-than-robust output, capable of going from "chimey" to "blistering" and hitting all the good spots in-between. It can also produce a wall of spooky, synth-like noise - just strum the 12-string neck while the pickups are on for the 6-string neck (or vice versa), and listen as the strings ring out with sympathetic vibrations. Neat!