description: audio-one rechargable battery-powered audio sub woofer. hi-tech rechargable bass sub-woofer >20hz @ 40watts! runs for about 6-8 hours on a single recharge. ideal addition to any sound system, small pa rig or backline amplifier setup. this is a rare, hand-made quality product and is in perfect condition. the sub-woofer comes with a professional flight case (with wheels). photos available on requests. to be picked up in paris, france