SimplyVibe V3-5CPS Bluetooth Mini Ultra Portable Speaker in Alloy Steel Housing with Rechargeable Li Battery (works w/ iPod, iPad, iPhone, Android Devices) - Best Sounding Mini Speaker in the Market!-Silver Color
I was amazed by the power of this small speaker.  I had tried several others, but this one proved to stand up to the test.  The range is good as well as the base and clarity.  It was simple to sync.