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LOL patience!
No the USB supplys the power from the xbox, no need for a mains.
I've had my 3 weeks and it's never dropped the signal or slowed an online game dramatically.
Yup this is what i use, £20 from ebay!
Set-up on PC/laptop by basically putting in your wireless name & password then plug it into the usb port (power) and ethernet port, and bobs a well know relative!