Designed to work with nearly any portable music source, the Stowaway Boomtube H201 portable speaker system transforms personal MP3 players, cellular MP3 phones, or even laptop computers into a portable party, It features two-inch aluminum speakers for great sound and a subwoofer like bass tube with more than 40 watts of total system power. Perfectly portable it's compact tubular design with twist-on speakers make for a perfect fit in any backpack, briefcase or overnight bag. Rechargable lithium-ion batteries mean you've got the power to listen whenever and where ever you want. Anodized aluminum housing resists stains and scratches. Aluminum speaker cones for better quality and style.