Get the most out of your iPhone 3G or 3GS with extended rechargeable battery case that virtually doubles your time to talk and surf. The case features a no-slip grip and soft-touch finish. Plus, by integrating the case and rechargeable battery in one convenient package. The durable 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 for a long time to come.And with the this battery case , you won't have to give up any of your iPhone's features or functionality. You'll be able to easily access all of the iPhone's controls--including the camera--and still get the sound you're used to from your phone's speaker. you can enjoy up to 21 extra hours of audio and 6 extra hours of video playback, in addition to iPhone's battery life. Use your iPhone adapter or any iPod connector to charge the battery case--either without your iPhone or with your iPhone simultaneously. And Smart Battery technology instructs the iPhone to always drain out the Slim Pack first. When you're done with Slim Pack, simply detach it, and you still have a fully charged iPhone.The battery case uses an advanced rechargeable Lithium-Polymer battery cell technology for added safety. Built-in circuitry prevents the battery case from shorting, over charging, or malfunctioning even under the most extreme conditions. The battery cell is highly condensed and is able to store and deliver an incredible amount of juice in a small and compact package.(no basketball and jersey adorning)Specifications:Product Name: LeafModel:SL-PR-0AWork with: iPhone 3G/3GSCapacities: 1550mAhBuilt-in Battery Type: Lithium ionStandby Time: Up to 230hrsTalk Time: Up to 7.5hrsInternet Use: Up to 5.5hrsAudio Playback: Up to 21hrsVideo Playback: Up to 6.2hrsSize: 134 * 67.5 * 20.5mmColor: Black.