Andoer Portable Source, 21W Foldable Sun with Dual USB Ports, Survival Tool for Camping and Hiking

HIGHLY PORTABLE: it on your backpack and make full use of sun power energy to charge during trips, and folded it to fit in your backpack for convenient carry.. WATERPROOF: polymer surface and outer PVC wrap can solar panel unexpected rainy or fog, just do not put it in moisture. MOST suitable: For almost devices like phone, tablet and so on devices with USB port. SMART TECHNOLOGY: Built-in intelligence chip can identify different device and change input current according to your device. FAST CHARGING: 21W sun power panel with more than 18.5% conversion efficiency and output peak current is 3500mAh totally for dual USB port