The largest chip on the board is the Broadcom Bluetooth controller chip marked with the red arrow.
Note the huge capacitor up near the top of the photo. That is where the Wii Nunchuck gets connected--apparently some significant power has to be transferred when the Nunchuck is attached.
Also notice the pen mark on the plastic cover. I'm guessing that is some Quality Assurance mark. Some worker must have put this together by hand.
Credit: Mark Kaelin/CNET Networks
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