A bit of prying frees the motherboard assembly from the rear housing.

A brassy semicircular ring surrounds the inner housing, providing a ground connection between the motherboard and outer bezel.

If you take a close look at the motherboard assembly, you'll notice five spring contact pads that line up with openings through the rear housing—perhaps an access point for programming, testing, or hardware hackers.

(Just peel up the FCC sticker under your watch band, without disassembling your Moto 360, to access these pins).