Harness the power of the sun with the Exec-Duo Solar eCharger to charge your iPhone and iPod Touch 3Gs while on the go. This leather case features 2 solar panels which fold compact into a leather travel holster. Dual solar panels increase efficiency. Recharging options for the iPhone and iPod touch are through the sun, internal Li-ion Battery (also rechargeable through the sun), or via a USB port. Can charge as a pass-through directly to the device or the internal Li-polymer battery. Charges via USB either from computer or USB charger. This portable charging system provides 2 extra hours of talk time when fully charged. Two 900 ampere hour lithium ion battery packs (total 1800 ampere hour) fully charge your device in less than 4 hours. It features a dual solar panel and lithium polymer battery plus a power display with Battery Status LEDs. To test the battery charge, press the power display button. Blue LEDs will light up according to charge from 25 percent, 50 percent, 75 percent and 100 percent. When a solar charging source is available, the red micro LED indicator will light up to show the unit is charging. Solar charging intensity can be shown by the blue LEDs depending on how strong the solar panels are receiving from the sun; ranges from 25 percent to 100 percent. 2000 milliampere battery extends your total use time to 7 hours. You can even continue to take pictures with your iPhone even with the case closed.