In the electronics industry's twin obsessions of products that are flat or small, what could be better than something that's both? TDK's Xa-10 mobile speakers, which are planned for the Japanese market, are not only flat but can also fit in your pocket with the approximate dimensions of an index card (but not quite as thin). MobileWhack says the thickness--0.63 inches, to be exact--is necessary to house a battery compartment, though the speakers can also be powered through a USB connection. The best part, other than their orange, lime and silver colors, is the price: $25.
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