I know what the red green black and red cables are for but what about the last one?
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That's the cable shield. It will be connected to 0V too, but carries no current. Steve
so connect it to the same as the black?
If you're connecting a real USB plug, it goes to the metal outer of the connector. A hub needs much more than just two connectors, it is an electronic board. Steve
but could i attach 2 female slots to it? (and be able to use them at the same time
No, you can't parallel USB connections. Steve
also do you know if i could connect 2 female (making it like a hub) ends to the aboveor will i need a circuit