Boostcase’s Hybrid is versatile protective case designed for both iPhone 4 and iPhone 4S. As we can see from the images, the iPhone 4S case consists of two parts, including a stylish, slim-fitting snap-on hard shell case in order to protect the iPhone 4 or 4S from bumps and scratches in a fashionable way, and a detachable backup battery with 1900mAh battery capacity, so you can conveniently charge your iPhone on the go. When not in use, you can also detach the battery pack from the protective case for portability. Apart from that, the iPhone 4 case also features battery status indicator, battery on/off switch and enhanced audio speaker output.
