ALLPOWERS 5V 10W Solar ChargerExclusive iSolar and Fast Charging Technology: It can automatically adjust the current and voltage to achieve maximum power delivering its fastest possible current up to 1. 6 Amps. High Efficiency: 10W sunpower solar cell is up to 23. 5% efficiency, while most panels in the market are 15% efficiency or even lower. Portable and lightweight design: Compact size design for portability(size as B5 paper), with the free top quality metal hook, you may just