Have the 3GJuice received recently and am delighted with the performance of this small force Protzes !! Together with the Artwizz Powerbatt I have now enough extra power on the go. Finally no longer be delivered to the low-dimensional battery of the iPhone, is a nice feeling. 3GJuice should be handled easily. Simply charge the USB port of PC or Mac, connect to the iPhone, and off you go. Can of course also charged with the Apple charger. A small drawback is the part, however: The plug of the battery is mounted at a slight angle, so the battery differs slightly from the horizontal line from. Is probably so intended by the manufacturer. WATCH OUT !!! Under no circumstances try to plug to bend horizontally. Irreparable damage to the battery or iPhone could be the result. The manufacturer warns specifically to its HP!