Hit the trail, boulder or water and share hours of high quality sound with fellow trekkers. 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 and portable design will keep the tunes going whether mounted to a bike stem or backpack. Dimensions: 6" x 5" x 3". Wt: 14.4 oz.