The mixit power pack 4000 lets you keep your devices charged no matter where you are this versatile charging device has two usb ports so you can charge tablets e readers and other usb enabled devices even when you dont have access to a power outlet or a computer simply charge the battery pack before leaving your house and connect it to your device using your usb cable whenever you need a charge the mixit power pack 4000 ensures that youll always have an extra charge within reach and