Features: 1. PET laminated solar panels with high-wear PVC fabric ensure its durability. 2. Two holders behind charger make panel perpendicular to sunlight, improving charge efficiency. 3. Compare to other products, open Vodool Solar Panel under sunlight can connect with your device to charger. 4. High efficiency solar thermal conversion, built with SunPower solar arrays, its conversion up to 21.5% ~ 23.5%, but most of panel on the market only 15% 5. Dual USB charger with 3.1A max. make charge fatly. Meanwhile, it can automatically test maximum current and voltage charge; fastest possible charging speed up to 2.4A max per port, overall to charge two devices simultaneously under direct sunlight. 6. Portable, foldable design for easy to carry or transport, water resistant to endure all weather conditions, great for nature trips, hiking, picnic, sailing or other outdoor activities ( Water resistant for the main body of the panel, not including the USB output ports ) 7. Suitable for iphone 6S Plus, Samsung Galaxy S7 Edge and more Specifications: Power: 20W Output1: 5V/2A Output2: 5V/2A Weight: 29.5ounces Conversion Efficiency: 23.5% Unfolded Size: 19.68in * 12in * 0.19in Folded Size: 12in * 6.88in * 1.18in