Use the Dual USB 10400 mAh Portable Battery Charger from Aluratek to charge two of your portable USB devices at once without the need for an AC outlet. The charger has a built-in Lithium-ion battery with a handy rapid charging feature that allows you to charge more quickly than from an AC outlet. There are also LED charge status indicator lights, so you'll always be able to keep tabs on how much battery power is left. Weighing just about half a pound, the charger is easy to slip into a backpack or bag and carry around as you navigate through your day. That way you'll have emergency power whenever you need it!