The mophie power boost xl portable charger is a compact and reliable power solution to charge smartphones, tablets, and other USB devices when you need them most. The led status indicator displays battery levels and charges status. Rest easy knowing your device is powered by the most trusted battery brand on the market. Equipped with charge vault technology, industry-leading mophie batteries hold their charge for an extended period of time so they are ready right when you need it. The digital power management system, capable of up to 2.1a output per port, uses smart charging circuitry to communicate with each device and determine the correct amount of power required for a safe, quick charge. Recharge your power boost battery by plugging the included micro USB cable into a USB wall adapter or laptop.