It can easy attach to your iPhone.
Battery Type: Lithium-ion battery.
Dimension: 67x62x15mm
Weight: 58g
Capacity: 1900mAh
Input Voltage: 5.25V +-0.25V
Output Voltage: 5.25V +-0.25V
Input Current: 500 MA MAX
Output Current: 800 MA MAX
Charge Time: Around 2-4 hours
Color: Black or White or OEM design

Usage:
Convenient charging anywhere, anytime
Compatible with iPhone / iPod.
Mobile charger maybe charged through the iPhone/iPod wall charger or a USB connection.
When charging your iPhone/iPod the upper LEDs will indicate power level of the unit
To check the remaining capacity of the mobile charger when not charging and not discharging, press the battery level indicator button at the top right of the unit.
When charging the mobile charger itself. once fully charged the LED marked "FULL" will illuminate.

COMPATIBLE WITH:
iPhone 2G 3G 3GS 4GS(All iPhone)
iPod nano 1st generation
iPod nano 2ND generation
iPod nano 3rd
iPod nano 4th
iPod with video
iPod classic
iPod touch