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
We purchased the SimplyVibe V3-5CPS Bluetooth Mini Ultra Speaker for use with our Windows phone and it works perfectly.  Contrary to other reviews I read about the unit, the volume up and down buttons do work and signal when it has reached max volume with a tone so you won't blow the speaker apart.