What You Get: Anker PowerPort Solar (21W 2-Port USB Solar Charger), 3ft Micro USB cable, welcome guide, our fan-favorite 18-month warranty and friendly customer service. Highly Portable: Compact size (11.1 × 6.3in folded or 26.4 × 11.1in opened) and stainless-steel eye-holes on each corner allow easy attachment to backpacks, trees, or tents. Lightweight and ultra-thin design make it ideal for long treks. Incredibly Durable: Industrial-strength PET polymer faced solar panels sewn into a rugged polyester canvas offer weather-resistant outdoor durability. Fast Charging Technology: PowerIQ delivers the charging speed up to 2.4 amps per port or 3 amps overall under direct sunlight. 21 watt SunPower solar array is 21.5-23.5% efficient, providing enough power to charge two devices simultaneously. The Anker Advantage: Join the 50 million+ powered by our leading technology.PRODUCT DESCRIPTION Anker PowerPort Solar Charge with the Power of the Sun From ANKER, America’s Leading USB Charging Brand - Faster and safer charging with our advanced technology - 50 million+ happy users and counting Off-the-grid Power When you're out enjoying the great outdoors, enjoy another perk: free limitless power. Simply spread out the solar panels or attach to your pack to start recharging your gadgets. Fast Charging Technology Exclusive to Anker, PowerIQ discovers and replicates your device’s original charging protocol to provide its fastest possible charging speed up to 2.4 amp per port or 3 amps overall (with enough direct sunlight). Superior Portability Compact design and rugged stainless-steel eye-holes on each corner make attaching it to a backpack or tent a cinch. Super lightweight and thin, it easily fits in a daypack. Incredibly Durable Industrial-strength PET plastic faced solar panels sewn into high-wear polyester canvas ensure it’s able to withstand the trials of your outdoor adventures. Advanced Safety Short circuit and surge protection technology keep you and your devices safe. For Optimal Use? Ability to charge your device dependent on sufficient sunlight. While the polyester canvas provides some water protection, we recommend minimizing moisture exposure to protect electrical components. Compatible with Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices except for the iPod nano, iPod Classic, HP TouchPad and Asus tablets. Note: This charger is not compatible with the iPod nano, iPod Classic, iPod Shuffle, HP TouchPad and Asus tablets. Not a battery. Does not hold its own charge. May only charge in direct sunlight.