These speakers may be small enough to fit on a keychain, but they pack some power. These little speakers are more than powerful enough to use when listening to your MP3s on the go. Just plug your iPod or MP3 player into the 3.5-mm audio jack.
Each version has a built in USB-rechargeable battery pack that will give you enough juice for about 2.5 hours of playback time. That’s pretty impressive for the size. They’ll cost you $25. Small speakers, big sound. What more do you want?