Folding charger uses the sun to charge most small USB devices and rechargeable AA batteries. It provides full charge in four hours of full sun, and a charging light on the side of the enclosure indicates charging status. Six grommets for secure fastening to a pack or to the ground. Folded dimensions 3.25" x 5.5" x 1.38"; unfolded 24" x 5.5". USB charging voltage 5.0V with up to 1.0A of charging current.