Delivering emergency charging when you run out of juice, the Belkin MIXIT 4000 Portable Power Pack is compatible with your USB enabled devices.This Portable Power Pack features two USB ports for charging two devices at the same time. Packed with 4000 mAh, it will provide hours of extra charge for your smartphone, tablet, eReader or other USB enabled device.Lightweight and compact, the MIXIT 4000 is your perfect travel companion - simply charge it before you leave the house and it will provide your devices with power - ideal for when you're out and about, travelling, camping or simply don't have access to a power outlet.For power when you need it most, rely on the blue Belkin MIXIT 4000 Portable Power Pack.