Here we have the DX External Battery Case for iPhone.
This case will double the battery life of your iPhone 4S or 4. It’s made of hard plastic and has a nice matte finish to it. I looks real sleek but the real “greatness” is in the functionality. This case can protect your phone, and also give you an extra iPhone battery when you need it. It even comes with a screen protector to give you literally 360 degree protection. The DX External Protective Battery Case has led indicators for the battery level and a smart On/Off Switch.
You can charge and sync your iPhone and Charge the case simultaneously while your iPhone is in the case via the Micro USB port.
Overall this is a great case and especially useful for anyone in need of longer talk time. It retails for $49.99 and is available at uNu’s website. For more information check it out here.