FlexSolar 5W/5V Portable Solar Panel with USB Port for Cell Phone Overcharge protection Compatible with any USB Device. Durable, Water-Resistant and Long Lifespan: with our integrated ETFE lamination process, its lifetime can up to 15-20 years under normal outdoor condition. Certificate and Warranty: FCC, RoHS, CE Certificate and many petents ensure high product quality also with 2 years service warranty. To enhance your user experience, we recommend you pair this product with a power bank