The speakers offer an iPod connection powered by four AA batteries that also charge the player. The sound is sufficient for a small group on a windy beach and provides a mobile form of music a bit more classy than hoisting a three foot boombox onto your shoulder. With the iPod secure in a zipped pocket, users can switch songs and adjust volume using controls on the right strap. A secondary feature allows users to store, and charge, their cell phone in a separate pocket. An incoming call interrupts the tunes a la the iPhone allowing handsfree talk and hang-up. While potentially practical for someone more important than me, my phone wasn't supported by the handful of included connections and to be honest I can imagine no correspondence on a Saturday afternoon that justifies pausing Tom Petty.