The solBAT II is a backup battery that charges through its solar panel and stores the power for future charging of any USB device.
Position the solBAT II in the sun by mounting via suction cups or clip and the 1500mA solBAT II slowly charges. When full the solBAT II puts out 5V through USB, which is enough power to charge your iPhone as quickly as you can from the wall.
The best part is the fair price of $30 (available soon). We will do a few review when we get our hands on this bad boy.