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Japanese manufacture OJI announced they will release a portable balanced amp.
OJI is known by their audio cable that mainly used by pro music engineers, and custom amps.

Here is their Japanese page.

The amp employs two mini plug as output jack and run off three AAA batteries.

Here is their blog (Japanese)
You will find one more unusual amp at the bottom of the page
They wrote it also run off battery with three AA. This one employs XLR in/out.