It is only three inches square and two inches thick, and silicone-coated. You may hang one in the shower or carry it about conveniently because it has a lanyard-style chain. If you spend an additional $15 for a second one, you can use them as a stereo pair. It is available in yellow, black, or red. With a stunning 80 hours of battery life at 50% volume, it is water- and dust-resistant and has an IP67 rating.
