Plug your cellphone, MP3 player, or other electronic devices into this device and charge or power them in the sunlight.  Charge the internal battery in this device during the day when there is sunlight and then use it to charge other batteries at night.  Plug other USB-powered devices into this and use it as an external battery pack.

The options are virtually endless!

Features: Super Efficient Solar panel Input: 5.5V @ 500mA Ultra High capacity built-in lithium polymer battery: 2600mAH Output voltage: 5.5V Output current: 800mA Solar charging: about 10-15 hours Charging with AC adapter or USB: about 5 hours Four ways to charge the battery By using the built-in solar panel By using USB charging cable and charge from USB port on a computer By using USB charging cable and included USB AC adapter and charge from the wall outlet By using a DC to USB (cigarette lighter) adapter (not included)

You can also add an optional AA/AAA battery charger.  Charge the AA/AAA batteries from the sun or from the battery inside the solar charger.