The grenade-size SRS-XB10 is the smallest and most basic of the new speakers in Sony's line of Extra Bass Bluetooth speakers. At this size "extra bass" might be a stretch, but it does have a bit more punch than many competitors.
Available in multiple colors -- Sony sent us a review sample of the more mundane-looking black version -- the water-resistant speaker's claim to fame is that it has good battery life for a tiny speaker and delivers relatively richer sound than the plethora of other tiny Bluetooth speakers on the market.
The speaker has a few extra features worth noting: The detachable strap, which could be used to hang the speaker from a hook in your shower or from a tree branch, converts into a stand for the speaker when you place it on its side in horizontal mode. You can also pair two of these speakers and use them as stereo speakers for your computer, for instance (you get more directional sound with the speaker on its side).
The step-up models in the line -- the SRS-XB20, SRS-XB-30 and-- have special lighting effects, with the two top-end models delivering "clublike lighting effects with an LED perimeter line-light, a strobe flash and speaker light." The XB10 doesn't light up; it's all about its sound.