When your Jetbook is discharged and you plug it into the computer it can cause many computers to shut down the usb port for consuming to much power. The dual cable is to supply the power from the second (RED) connector. This doubles the amount of power your computer can supply to the Jetbook for charging.
Note: If you plug in only the red connector you will see that your Jetbook is not detected by the computer because there is no data lines connected.
Just plug into two adjacent ports and everything will work fine. Also if your charge is not down that far you do not need to plug in both connectors.
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