The Jawbone JAMBOX delivers rich hi-fi audio in a compact, portable wireless speaker that's just under six inches long. And it's loud. With an output capacity of 85 decibels (most rock concerts reach 120), JAMBOX fills even the largest rooms. Unlike other portable speakers, JAMBOX is powered by a pair of proprietary, highly sophisticated acoustic drivers, unmatched in their ability to produce extreme high (tweeter) and low (woofer) frequencies from a single, ultra-small dome speaker. They work in concert with an innovative moving-wall, passive bass radiator and airtight enclosure to deliver shimmering highs and thumping lows that you can literally feel. It's the biggest sound you can hold in the palm of your hand.