Ah, totally missed that. Thanks! I'm so tempted to connect the included male-to-male wire to both jacks; would be useful when transporting it. Would that create an internal acoustic feedback loop and damage the device, I wonder?

Look carefully on the side where the battery is (mine's translucent enough to read part numbers); there's an icon of earphones beside one jack, and an icon that apparently indicates input beside the other. Agreed, it's not terribly visible! :-) You can also figure out which is which by plugging the earphones into one or the other; when you get the earphone jack, a blue LED turns on, indicating that the amp has turned on. I'm liking it; prefer a lot to FiiO that I got a couple years ago.