Suaoki Smart Charging TIR-C Technology: built-in IC for each USB port enables the charger to automatically recognize your device's current and adjust output to speed up the charging process (up to 2.1A max per port or 4.0 A max overall under direct sunlight) High Conversion Efficiency: 25W SUNPOWER mono-crystalline solar panel increases conversion efficiency up to 25%, providing enough power to charge 2 devices simultaneously Ultra Portable for Off-the-Grid Life: Quadruple fold design (10.4" × 6.3" / 265 x 160mm folded) and lightweight (1.65lbs / 749g) make it ideal for camping, traveling and 4 carabiner hooks allow easy attachment to backpacks, trees or tents Water-Resistant Layer for the Solar Panel: you can charge your devices and enjoy the sunlight near the swimming pool or at the beach without the fear of getting your devices wet Package & Warranty: 25W Foldable Dual-Port Solar Charger, Micro USB Cable, 4 Hooks, User Manual, 18-month warranty and friendly customer service