Runtastic Battery Case für I Phone 4/4S - Running accessories - Black
The Runtastic Battery Case extends the life of your iPhone battery by many hours. It is perfect for long fitness activities (10+ hours of hiking, biking, ...). The Runtastic Battery Case also serves as a protective case, an integrated On/Off key and an integrated USB cable, so there is no external cable needed to charge battery. Thanks to the sync function you can always stay up to date how much battery power you have left.
iPhone: iPhone 4, iPhone 4S