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This smart ring is basically an April Fool's joke, but is it ahead of the curve?

Casio's mini-watch/smart ring is more of a novelty than a game-changer, but plenty of people want smart rings with some kind of screen.

(Image credit: Derrek Lee / Android Central)Most smart rings are meant to be invisible; unless you look at the companion app on your phone, you wouldn't even know if it's working. The original Pro had a button to end haptic feedback, while the newer Circular Slim has a reactive touch surface on the logo. Though there's no guarantee any of them will successfully launch, and they have other ambitious promises like blood pressure tracking, people still spend millions on these prototypes, hoping for the best.

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