Goal Zero Rock Out SpeakersHit the trail or the office and share hours of high quality sound with fellow music lovers. The Rock-Out pumps sound from your ipod, mp3, mp4 and other audio devices through its integrated speakers. Simply plug the Rock-Out into the headphone or audio jack of your device and hit play. Its rugged design will keep the tunes going whether mounted to a bike, backpack or climbing harness. Comes complete with USB to mini USB cord. Up to 20 hours of play off 2 hours of charging! High quality sound in a lightweight durable package. Will recharge with any Goal Zero solar panel system or kit. Measures 6" x 3" x 3 1/2". Weighs .91 lbs.