The thorough eBay description says it all:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300300553061&ssPageName=STRK:MEWAX:ITThis is a sweet-sounding, quiet, little oversampling DAC that runs on 12VDC. As you can see in the eBay listing, parts quality is pretty good.
It's broken-in, but doesn't have many hours on it otherwise. I just don't have any need for it. It obviously doesn't consume much power, and would be an excellent candidate for a battery supply.
I'm using a good, regulated power supply with it. The power supply is visible in the bottom of this photo:

I'm willing to sell the power supply for $100, power cable included. I don't recall the amperage rating on the power supply, but I can find out. It's substantial enough to run most 12VDC line level hardware.
(The digital cable visible in the photo is also available.)