ReVIVE Solar ReStore XL 4000mAh Solar Charger Power Bank & USB Rechargeable External Battery Travel Pack w/ Universal USB Charging Port & High-Efficiency Solar Panel for MP3 Media Players, Smartphones , E-readers , iPad and More!
I don't think it's worth buying. Cheaply made and the unit to attach it to the supplemental charger broke the first time I used it. I returned it to Amazon, and will be looking elsewhere for a solar charger as I do want one I can count on.