Grace Digital Audio’s ECOXGEAR label has introduced the ECOXBT ($130) Bluetooth speaker, compatible with iPads, iPhones, and Bluetooth-capable iPods. The ECOXBT is a portable, ruggedized, 100 percent waterproof speaker that floats, uniquely equipped with handles for easy in-pool use. Somewhat amazingly, it also includes a built-in waterproof mic so iPhone users can answer calls using its speakerphone function. Weighing 1.5 lbs., the ECOXBT promises…