Packing a massive rechargeable 10,000mAh Li-ion battery that supports up to 15 hours of playtime and dual USB charge out, this speaker easily keeps music and devices going for as long as users need them to. They can trust JBL Xtreme to bring the excitement wherever it’s needed - whether indoors or outdoors, poolside party or backyard barbeque - with its splashproof fabric design. It also features a noise and echo cancelling speakerphone for clear conference calls, and JBL Connect that can wirelessly link multiple JBL Connect enabled speakers together to amplify the listening experience. Product Features: Hear the bass, feel the bass, see the bass. Dual external passive radiators demonstrate just how powerful the speakers are. Splashproof means no more worrying about rain or spills; users can even clean it with running tap water. Just don't submerge it. Take crystal clear calls from the speaker with the touch of a button thanks to the noise and echo cancelling speakerphone. Built-in rechargeable Li-ion battery supports up to 15 hours of playtime and charges devices via dual USB ports. Wirelessly connect up to 3 smartphones or tablets to the speaker and take turns playing earth-shaking, powerful stereo sound.