5W, which happens to be 50 % the wattage a MagSafe iPhone is able to handling. That was not issue, because it is a power bank that can stick to your mobile phone for quite a while, so pace won't be in the essence. UAG Lucent Power Kickstand for $50: https://josuekkkjj.tinyblogging.com/considerations-to-know-about-anker-power-bank-70436366