High Efficiency and Humanize Design : Our Solar Charger With 23% Efficiency and Adjustable Support To Get Best Charging Angle; 
Highest Solar Power For USB Devices: 21W Solar Panel with 3 Pieces, with Highest Power to Charge For USB Devices, like Phone, Tablet or Power Bank ; 
Unique Two USB Controller Design: The Voltage Is Stable To Charge For Your all Kinds of USB devices; 
Durable and Comfortable :The Solar Charger with high quality material,PVC600D Waterproof Fabric and Some Parts of Leather Material;