From http://www.netgear.com/product_view.asp?xrp=11&yrp=30&zrp=92

Dimensions L: 163 mm (6.4 in)
W: 143 mm (5.6 in)
H: 27 mm (1.1 in)

I'll photo a picture of it sitting my my stereo stack when I get home. As to power requirements, it comes with it's own external power supply, which supplies 5V at 1A.
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Remind me to change my signature to something more interesting someday