The Choetech 19 watt Dual USB ports portable solar charger with SunPower solar panel provides enough power to charge cell phone and iPad at the same time. It uses fast charging technology. Auto Detect Tech delivers the fastest possible charging speed up to 2.4 amps per port or 3 amps overall under direct sunlight. This solar charger is slim and powerful has high-efficiency conversion rate, so it can capture more sunlight than conventional solar panels, do not need much sunlight to charge items. The transformation efficiency is up to 22%-25%, while most of the similar products on the market is 15% or even lower. Rugged stainless-steel eye-holes on each corner make attaching it to a backpack or tent a cinch. Super lightweight (16.9oz) and , it easily fits in a daypack. Free limitless power, Simply spread out the solar panels or attach to your pack to start recharging your gadgets. Industrial-strength PET plastic faced solar panels sewn into high-wear polyester canvas ensure it's able to withstand the trials of your outdoor adventures. Short circuit and surge protection technology keep you and your devices safe.