Unlike most other solar panels on the market, Poweradd foldable Solar Panel Portable Solar Charger has two major breakthroughs. Highest efficiency -The transformation efficiency of Poweradd solar panel is up to 22%, while most of the similar products on the market is 15% or even lower. Secondly, the unique design – Equipped with Voltage Regulator to ensure stability. The Solar Panel Portable Solar Charger is capable of charging both laptops and mobile phones simultaneously.