... crisp sound. One full-range driver and one passive radiator for bass reinforcement♦Rechargeable Built-in rechargeable 15-hour lithium-ion ... batteryExquisite design,easy cooperating easy to carry on anywhereUsing for meeting,travelling,car kit,children teaching ,it fits :PC ... , 1 pc switch line,1 pc users manual . Hot sale 2013 super mini portable new design hi fi stereo response bluetooth speaker