Solar Panel, YOKKAO 15W 4-Panel Portable Foldable Splashproof Solar Power Charger with Dual USB Ports for Smartphone, GPS, PSP, Camera PERFECT DESIGN - This solar panel is made up of 4 panels. With foldable design, easy to carry around, eyeholes enable easy attachment to backpacks while hiking; With high quality design: PET+Mono Solar Cell+PVC Waterproof cloth. Portable and frame design fits for outdoor and indoor use HIGH EFFICIENCY - 15W high-efficiency solar panel provides up to 18% conversion efficiency. With dual usb ports, provides enough power to change two devices at the same time. High conversion solar charging technology keeps your device powered up with free solar power, providing enough power to charge 2 devices simultaneously. CHARGE DESCRIPTION - The time and current of charge depends on illuminance. It is better to charge power bank to store electricity as the solar panel can not store electricity. WIDE COMPATIBILITY - This solar charger compatible with most USB-Charged devices. Such as Smartphones, tablets, GPS, PSP, MP3, MP4, digital camera. 100% green energy without consuming carbon. WHAT WE CARE - We don't care about any profits or any earns. What we DO care about is that customers have happy purchasing experience and TRUST Yokkao brand after the first using. It is a great decision if you choose Yokkao.