The core of Interval is a black hard plastic and gray rubber box that holds the second-generation iPod shuffle snugly inside, using a pressure clasp to seal the enclosure tight against water intrusion. Once again, it promises to keep your shuffle safe when submerged in water at up to 12-foot depths, and permits access to the device’s front-mounted play/pause, volume, and track controls; you need to flip the power and/or shuffle mode…
