I am not familiar with this particular unit, but using other similar devises I am assuming you are refering to the use of the USB port. When some devices connect to usb power sources they do not send correct protocol asking for a set ammount of power, they short with a particular resistor between command wires this is used to fool the power supply to give the maximum alowable power to the USB port. The flashing LED may be the targus unit trying to comunicate. If the question is refering to the 120v outlets ignore above. If there is no apparent problem with your equipment I would ignore it as the manufacturer states the unit is protected for various issues including overload.
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I am not familiar with this particular unit, but using other similar devises I am assuming you are refering to the use of the USB port.
When some devices connect to usb power sources they do not send correct protocol asking for a set ammount of power, they short with a particular resistor between command wires this is used to fool the power supply to give the maximum alowable power to the USB port.
The flashing LED may be the targus unit trying to comunicate.
If the question is refering to the 120v outlets ignore above.
If there is no apparent problem with your equipment I would ignore it as the manufacturer states the unit is protected for various issues including overload.