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Continue to ChatThe Pro Trek WSD-F21HR is the first Casio to feature heart rate tracking https://www.stuff.tv/hot-stuff/wearables/pro-trek-wsd-f21hr-first-casio-feature-heart-rate-tracking/
The Pro Trek WSD-F21HR is the first Casio to feature heart rate tracking https://www.stuff.tv/hot-stuff/wearables/pro-trek-wsd-f21hr-first-casio-feature-heart-rate-tracking/