Boostcase's award-winning durable, non-slip, lightweight and slim-fitting cases and battery sleeves for the iPhone 4 are at the forefront of innovation. The detachable battery sleeve works to virtually double the battery life of your iPhone, allowing for more time between charges. It's perfect for the iPhone owner who absolutely, positively needs to stay connected.

The Boostcase battery sleeve is slim, easy to use and slides onto your iPhone 4, with no wires or separate battery pack. Available in numerous classic and stylish colors, Boostcase has a color for everyone, and a battery solution for anyone who has been frustrated with the often too-short iPhone standard battery life. Boostcase is where fashion meets function!