Sony - Feel like youve dived into the front row of the concert, and turn the moment on with the ULT Power Sound series. Built for music lovers, it produces powerful deep sound designed to make your heart tremble. Prepare to feel the bass.Bring your favorite tunes everywhere with enhanced bass built into a compact package. Complete with a multi-way strap for ease of use, take your waterproof, dustproof, and even shockproof speaker anywhere for longer, thanks to a long battery life.