The Power Bank has a really high capacity and works perfectly so far. The built-in lamp as well. Although you have to order a charger in addition, but it's worth it. I can my iPhone 4s 6x from the Power Bank again fully charged. To fully charge the Power Bank, in addition ordered 2 Amp power supply required for several hours. Despite the size and weight of the Power Bank is still to carry in your pocket or even a shirt pocket.