CHOETECH 24W Solar Charger Backpack Kit for iPhone, iPad, Samsung and Other USB Compatible Devices 24W of Power: The solar charger produces up to 24W of power and delivers charging speed up to 2.4A per port or 4A overall under direct sunlight. High Efficient: Operates with SunPower solar panels with high conversion rate up to 23-24%, providing enough power to charge two devices at a time. Highly Portable: Lightweight and foldable design with three webbing loops on each side, allowing easy attachment to backpacks or tents, a great choice of outdoor life. Packable Backpack - The backpack is ultra lightweight, water resistant and packable, a prefecttravel solution that transforms into a full-size daypack or folds up into its pack-in pocket for easy storage and carrying. The pack-in pocket doubles as an inner pocket as in full size. What You Get: 1*CHOETECH 24W Solar Charger, 1*Backpack, 4*Carabiner Clips, 1*Micro USB Charging Cable, 18-Month Warranty & Friendly Customer Service