FirstSing FS09039 Power Case with Built-In Rechargeable Li-Ion Battery for iPhone 4G
* The iphone 4G power case is made from ATL Polymer lithium-ion battery cell which is the best quality of the world.(ATL is the manufacture who produce battery for Apple iphone.)
* 1800 - 2400mah and kinds of battery capacity last for a very long time. The cells use a USB port for iPhone charging, no need to get it out, just charge directly charger,and the appearance is noble and fashionable.
* Color available: blue+black, green+black,orange+black,full black, full white, and customized colors are available.
* Gift box include: iphone 4G power case,USB data cable, manual.

Specifications
Batteries: lithium ion polymer batteries
Output voltage: DC5V
Output Current: ≤ 700mA (0.7A)
Input voltage: 5V
Input current: ≤ 1000mA (1A)
Capacity: 1900mAh (1200mAh, 2400mAh choice)
Charging time :4-6 hours
Cycle Life:> 500
Operating temperature: -10 ℃ -40 ℃
Storage temperature: -20 ℃ ~ +50 ℃
Body product: 125 × 62 × 18 (mm)
Weight: 68g
Standby time:> 450 hours
Talk time: 3G network more than 8.5 hours / 2G network of more than 15 hours
Internet access: 3G network more than 8.5 hours / Wi-Fi over 10 hours
Music: more than 36 hours
Video playback: over 10 hours