Feature: - SunPower 21W single crystal versatile mobile solar power - High conversion rate, high yield. - Tensile strength, can withstand different environment, waterproof performance is g ood. - High stability, good durability - With Chip Sunpower, charging speed, the voltage stability. - Foldable design, collapsible expandable, easy to carry. - Strong compatibility, mobile phones, tablets, charging Po, cameras and other travel equipment can be charged. Technical specifications: