Bluetooth Wireless Connectivity, 360° Sound, Dual 40mm Active Drivers, Pair up to 2 Mobile Devices at Once, IPX7 Waterproof Rating, Pairs with Other WONDERBOOM Speakers, Micro-USB Charging Port, Last up to 10 Hours on a Full Charge. Enjoy 360? sound that is crisp clear and balanced with the avocado WONDERBOOM Freestyle Portable Mini Bluetooth Speaker from Ultimate Ears. The WONDERBOOM speaker combines enhanced audio power and a vibrant unique design. Portable and Bluetooth ready this speaker features a maximum sound level at 86 dBC with two 40mm active drivers and two passive radiators.Dip dunk splash soak or submerge it. The WONDERBOOM Freestyle speaker is completely waterproof. It floats in the pool or a beverage cooler and if it falls in a puddle or mud just rinse it off. This speaker packs 10 hours of battery life into its portable size. Press a button to wirelessly connect the WONDERBOOM to a friends' WONDERBOOM speaker for an enhanced music experience.