Jt Jones on X: "This is the casio BP- 400, released in 1991 it could measure heart rate and blood pressure. Yes 1991. Casio has made some of the weirdest yet functional
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The original smartwatches: Casio's history of wild wrist designs - The Verge
The weird and wonderful G-8100… : r/gshock
The original smartwatches: Casio's history of wild wrist designs - The Verge