Hear the bass, feel the bass, see the bass. Dual external passive radiators demonstrate just how powerful your speakers are Splashproof means no more worrying about rain or spills; you can even clean it with running tap water. Just don't submerge it. Take Crystal clear calls from your 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.