This is a combined iphone iphone 4s battey /charger/stand and is designed to give you some emergency power to charge your phone away from a plug socket.
The device is quite compact, looks fine and appears well made. A doddle to use, just plug in the USB cable to your comp to charge the battery and then plug in your phone. Then you can sync to itunes etc.my iphone 4 fits in snugly.
However my only issue is that you cant plug in your phone if it has any kind of case on it. you have to remove it in order for it to fit. Would have been good to have adjustable side grips.
Overall pretty good.