Features: Wirelessly connect up to 3 smartphones or tablets to the speaker and take turns playing earth-shaking, powerful stereo sound. Built-in rechargeable Li-ion battery supports up to 15 hours of playtime and charges devices via dual USB ports. Durable fabric material and rugged rugged rubber housing allows your speaker to outlast all of your adventures. Take crystal clear calls from your speaker with the touch of a button thanks to the noise and echo cancelling speakerphone.