External battery cover for iPhone 4 (2300mAh)
Model: NP-IP4A
Real capacity: 2300MAH
Output voltage: 5V
Output current: 500mA
Input voltage: 5V
Input current: 500mA
Charging time: 3～4H
Holding time for calling: 3G network > 7 Hours /2G network > 13.5 Hours
Time for net play: 3G net work >7 Hours / Wi-Fi >8 Hours
Time for music play: more than 30 hours
Time for video play: more than 8 hours

Input charging: connect the mini USB port with a USB cable connect on to the computer

or USB AC adapter for charging this external battery case

Standard accessory: 1pc screen protector, 1 standard 2.0 USB cable

Optional color: red, blue,black, white.

Optional color: (Black, red,blue), also pink and white can do with bulk order