5W, which is 50 percent the wattage a MagSafe iPhone is capable of managing. Which was not difficulty, because it is a power bank which will stick with your cell phone for quite a while, so speed won't be on the essence. Seeking a laptop charger? Here's our best portable https://garrettvwwxw.liberty-blog.com/26828151/5-simple-statements-about-portable-power-bank-explained