eBay daily gadget: portable speakers for mp3 players for $7.50

One of the current trinkety deals of the day on eBay is this rechargable stereo speaker for $7.50 with free first-class mail shipping by eBay seller "MonsterCellular". This is charged by USB and claims to playback for 12 hours on a single full charge. It works with devices that have a 3.5mm audio socket according to the eBay product description. This is a small little thing, intended for mp3 players and cellphones. As usual with eBay daily deals, they could last anywhere from hours to days.