Virgin VS2100 Boomtube EX Portable 40 Watt Speaker System Portable speaker system for MP3 players, CD players, or even laptop computers Compact tubular design with twist-on speakers make for a perfect fit in any backpack, briefcase subwoofer-like bass tube with more than 40 watts of total system power Headphone input jack for muting the speakers and listening with headphones Powered by rechargable lithium battery