The otter has ears
Protecting a smart phone from the elements is tricky business. You need a case that keeps out dirt and water yet allows sound to pass through at the microphone and speaker openings. Otterbox (www.otterbox.com), maker of all manner of ruggedized cases
for laptops, handheld devices, tablet PCs and more, has solved this dilemma by using acoustic vents from a third-party company called Donaldson.
The vents carry an IP54 water protection rating, which means they can withstand splashes and heavy rain ' but they don't protect against total immersion. They also keep out oils and perspiration and can withstand temperature fluctuations.