As a small and portable product, it comes with USB cable for charging from PC USB port.
Can charge iPhone 3Gs, iPhone 4, iPod Touch directly.
Also with a USB female output, it can be used as a universal charger to charge other Mobile Phones, PSP, MP3/MP4, PDA etc.

Specifiction:

Li-ion rechargeble battery:3.7V/850mAh
output volt/current:5.5V/500mA
PC USB charging:5V/500mA
charging time:
mobile phone charging time:1-2hours
Self-charging through PC USB port:3-4hours
Guage display method 3LEDs
Pretection:reverse current protection circuit integrated to prevent batteries from being discharged
Constants Volts:4.2volts
Size:35mmX64mmX18mm
Clour:white/black