The FSP iON C2200 is a portable battery that has two usb outputs. It can deliver 2200mAh of power which is like having a spare IPhone battery or Droid battery. What is great is that even though it was meant for charing your phone, you can use it for other things that are powered through usb. The battery can be recharged approximately 500 times before it begins to lose efficiency. After 500 charges the battery can discharge thousands of times at approximately 80 percent efficiency. This portable battery is great for having extra power for your Blackberry, Droid, or iPhone when you know you will not be able to charge your phone for an extended period of time. It comes in handy on the plane, while your camping, on movie sets, or in any setting where a charging source is not readily available.