6.6 feet underwater for 30 minutes. The case will also protect your phone from a 10 foot drop onto concrete, and 2 tons of a crushing weight. It will also keep dust and debris out.
To compete with cases like the mophie (got it right!) Juice Pack, OtterBox has introduced the Defender Series with iOn Intelligence. This is a protective case that also features a 1450mAh lithium ion battery which recharges three times faster than the competition. LED indicators let you know how much battery life you have left and an app allows you to "intelligently charge the phone without the need to monitor power levels and turn it on or off." The Defender Series with iON Intelligence is available for both the Apple iPhone 4 and Apple iPhone 4S. There is no word on when the case will be ready for Apple iPhone 5 users.
OtterBox did not divulge pricing information on either model.