Olympic stones seem to have 2 green lights on it, and it would be weird to have 2 dels light up if there are nothing else electronically speaking in the stone.

So what are the electronics in the stone, and what do they serve?

1 Answer 1


This is the "Eye on the Hog". It enforces the requirement that the stone must be released before the hog line to be valid.

  • And as an aside, the electronics are solely in the handle, not in the stone.
    – Rory Alsop
    Feb 9 at 17:54

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