Foldable, four-panel design is narrow, more compact, and extremely lightweight, making it a great portable option for everyday use. Hang it on a daypack, or even a school backpack, to charge your micro-USB devices on the go! PowerFilm solar panel charges two AA batteries from fully spent to full charge in just four hours (in full sun). Utilizes USB port and two rechargeable batteries (included) for direct charging of most portable devices. These go for 99.99 new asking 60 or am very willing to trades. Let me know what you have am looking for tarps and hammocks.