This Bluetooth shower speaker earned The Best designation from The Hammacher Schlemmer Institute because it produced the best-quality sound and was easiest to use. Institute Analysts compared 29 different models of Bluetooth speakers and the Best Speaker delivered the loudest (105db) crispest audio that could be heard easily over running water, unlike inferior models with tinny, muffled sound. The Best Speaker has large, easy-to-press buttons that control pause/play and skip, volume can be adjusted from the speaker or your paired device, and a built-in microphone lets you take phone calls while in the shower, if you so choose. The speaker has an IPX7 waterproof rating, and it even floats, making it ideal for carefree use outdoors near a pool or hot tub. A large suction cup keeps the speaker securely affixed to a shower wall, unlike lesser units that quickly lost suction and dropped off. Its rechargeable battery provides 10 hours of continuous play from a 90-minute charge via the included USB cable. 3 1/2" H x 3 1/2" W x 3 1/2" D. (8 oz.)