Aluratek's APB04F 10400mAh portable external battery charger is a convenient solution to charge most portable devices when you don't have the convenience of an AC outlet nearby. The APB04F dual USB external battery pack uses the latest Lithium-Ion battery technology offering superior charging capability. If you need a quick charge you will love the rapid charging feature which enables your device to charge external USB devices faster than an electrical AC outlet. With the included LED charge status indicator lights, you will know how much battery power is remaining to charge your devices.