What does a usb adapter do?

JamesL

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I'm planning on getting a Netgear N600 Wireless Dual Band Gigabit Router
WNDR3700 for my mac, home theater system, and xbox 360. There is also a Netgear RangeMax Dual Band Wireless-N USB 2.0 Adapter that they sell seperately for $60-70. I'm still confused about why i would need a usb adapter, when all of my systems can connect to the router wirelessly. Is it for the 5ghz frequency of the dual band? or what?

Can anyone explain this to me?
 
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