This removable battery pack can charge your cell phone, Bluetooth headset, MP3 player and virtually any device that has a micro USB port.
This package can give you up to one hour of extra talk time.
It gives you access to all forms of digital media wherever and when you need it.
When the battery pack is plugged into any USB port as in a computer or in a car charger so it will automatically charge its own internal battery.
So in other words, it will charge both its own battery and your handset at the same time!