Blue and Black
Blue symbolizes USB 3.0 enabled.
You can transfer at blazing faster rate.
Tip: Next time connect your external hard
drive to it.
Black symbolizes USB 2.0 and 1.1 compliant.
It is Standard Ports.
Tip: Next time connect your Mouse or other related
devices to it.
Yellow
Yellow symbolizes Always-On.
It supplies power to the gadget even while in
sleep mode or off.
Tip: Next time you can charge your phone
while on the go in the car.
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