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The OtterBox Defender Case with Ion Technology for Apple iPhone 4S (Graphite) is a rugged protection and two times the battery capacity with a power management app for the ultimate experience in empowered protection. This battery case for iPhone 4/4S combines industry-leading and patented three-layer protection of the Defender Series with smart and seamless power.
The iON Intelligence software is an app that estimates battery power and predicts battery time remaining by monitoring your device-usage habits. This app allows you to eliminate guesswork by clearly displaying the power status for both the case and your device and intelligently predicts when your phone battery will run out. The iON Intelligence app monitors and incorporates many different factors to create the most accurate, personalized power profile possible.