Small and compact the 6,600 mAh Li-Ion battery device is powerful enough to charge all generations of iPad, Kindle and other Tablet/eReader Devices that use USB connecting cables. Energy Bar can also charge Smartphones like iPhone, Android OS Smartphones, and Blackberry. If you have multiple devices to charge the Zoom Energy Bar is accommodating by having two USB outputs to charge multiple devices at the same time. "Zoom" charging technology allows you to charge your device at an output speed up to 2.1 Amps, so you can quickly keep all of your mobile devices operational. Includes 7 adapting tips. Energy Bar fully charges in 9 hours and will hold its charge for 900 hours, over a month, of standby time so it's ready to use when you need it most.