Specification :

1) Virtually double your power. 2) Battery and Case in One. 3) Charge and sync your iPhone to iTunes without removing it from the juice pack air. 4) Intelligent Power Distribution. 5) Powerful and Safe Battery Cell Built in overcharge, short-circuit and temperature protection. Latest in lithium . 6) Light LED Battery Status Indicator, The integrated LED status indicator tells you exactly how much juice is left in your juice pack air. 7) You can use the included USB cable to charge the juice pack air. 8) In an ultra-thin, light-weight, low-profile design

* Standby Time: Up to 270 hours. * Talk Time: Up to 4.5 hours on 3G | Up to 10 hours on 2G. * Internet Use: Up to 4.5 hours on 3G | Up to 8 hours on Wi-Fi. * Audio Playback: Up to 27 hours. * Video Playback: Up to 9 hours.