The concept behind iS2 is simple: provide a watertight enclosure that keeps the cheap, screenless shuffle dry even when it?s taken up to 10 feet under water. To accomplish this, H2O Audio has created a smaller, second-generation iPod shuffle-sized version of the same waterproof case it developed for its just-a-little-too-late first-generation Waterproof Housing for iPod shuffle: it uses a hard plastic frame and belt clip to hold the shuffle,?