That said, if you do feed it bass-heavy material, it can start to sound crunchy (read: distorted), especially if you crank the volume. To me it sounded best at midlevel volumes and like a lot of these smaller speakers, it performs best in the midrange, so it sounds better with acoustic material and lighter listening tracks. It's also makes a decent little speaker for movie watching on your notebook or tablet device.
The Micro has a built-in rechargeable battery (you charge with an included Micro-USB cable) that's gives you about 5 hours of listening time. That's not great, but it's not bad either, and par for the course for these smaller speakers.