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The Ex-Era case has an edge as everything is exchangeable. You can EX-change bumpers in a great selection colors to match your latest fashion accessories. You can EX-change backcovers in any design to make the iphone as distinct as you. You can evenEX-change the battery module with a powerful uNu battery cell which powers up your digital life like a breeze. EX-ERA enables all possibility for your iPhone. Double the battery lifeEx-Era can double the usage time for your iPhone 4 and 4S and helps users fully utilize their iPhone to complete daily tasks, such as Talk, web, text, video, music and gaming, without worrying about always having to recharge. Made for iPhoneFeaturing Apple's coveted Made for iPhone certification, this powerful smart battery case has passed various lab test to ensure safety and reliability Detachable DesignThe EX-Era case is designed to its minimum form factor, plus a 2 piece slide-on detachable design, Ex-Era will only add the bulk when you need extra juice Swappable BatteryThe Ex-Era features a swappable battery module. It enables endless power supply for your iPhone with additional batteries (purchased separately) A Powerful Battery Case Or A Stylish Slim Case? The answer is BOTH. Ex-Era comes with a ultra-thin back cover in either glossy white or matta black, which converts the bulky power case to a stylish slim case. Fully protectedThe durable and stylish case offers the full protection of a hard-shell case and will protect your iPhone from bumps and scratches, so your phone will look and function like new. Fully functionalDon't give up any iPhone features or functionality. With the Exera, you'll be able to easily access all of your controls, as well as speaker and microphone.