Improved from the company's past iPod nano waterproof cases, H2O Audio's iN3 Waterproof Case ($80) now includes a screw-on belt clip, as well as a neoprene armband carrier and second removable T-Seal to keep water from breaching the case's latched hard shell design. As before, iN3 requires you to separately purchase H2O's waterproof headphones, which together enable you to use your nano safely underwater at depths of up to 10 feet. A sophisticated…
