Smart Charging Technology Our 20w USB port solar charger allows you to charge your devices at any time. It comes with smart charging technology that intelligently identifies your device and then provides optimal charging. The high-efficiency 20w USB solar charger can achieve a conversion efficiency of 20 percent while providing sufficient power. And its also durable and wear-resistant. Portable and Foldable The compact size (165x105x20 mm or 6.5x4.13x0.79 inches when folded) and lightweight (320 g) design make the Travel Solar Panel Battery Charger an ideal tool for outdoor activities. Easy to use Unfold the foldable solar charger outdoors in direct sunlight, then connect your device to a USB port using a certified cable and it's ready to go. It has overcurrent, overheating and short circuit protection to ensure safe charging. Wide Applications This solar panel with USB port can charge various mobile phones or S electronic devices under the sun. Please note that this solar panel cannot store power and charge your laptop. feature: 1. Made of high-quality materials, waterproof, durable and sensitive. 2. Can be used to charge mobile phones, mobile power supplies, etc. 3. Light weight, foldable and easy to carry. 4. Lightweight and ultra-thin, easy to store and install. 5. Suitable for outdoor activities, emergencies, and outdoor operations, and can continue to provide power even on cloudy days. Specification: Material: polyester fiber Color: camouflage Waterproof grade: IP65 Solar energy conversion rate: 18-19.5 percent Maximum power (Pmax): 20W Maximum power current (Imp): 1A Number of batteries: 36 cells Output: USB5V Open circuit voltage (VOC): 5V Expanded size: about 440x165x3mm or 17.32x6.5x0.12inch Folded size: approx. 165x105x20mm or 6.5x4.13x0.79 inches Product net weight: 320g Short circuit current (Isc): 2000 hA Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.