Just throwing this pic out there. This amp in silver sells for 80 dollars, for whatever reason, the same amp in black is generally won for roughly 25 dollars and 16 for shipping, so it seems like a low enough cost to give it a shot, for me anyway, it ended up costing me 41 dollars, shipping included. It's rechargeable and rated for headphones 16-600 ohms, with a claimed 500 mw output. I don't have it yet, but thought I'd give a heads up in case the black version also starts selling for the 79 dollar buy it now only. Could be an awesome portable amp for the money. A pic from the ebay store below. I'll post impressions after I have it.