Small easy and loud. Sony Ericsson is one of the best phone developers and with assessories like the MS500 you can see why. Small and light, really serves what one person is looking for, while out climbing, biking, alone, MS500 helps keep your sanity. Just don't bring it with a group of friends or play it like the old boom boxes. No charging required. Just pop in the included AA batteries and crank your tunes. You'll turn up the volume on any outfit with this splash-proof speaker.