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 "Casio Pro Trek WSD-F20 smartwatch review: Rugged watch for tough conditions")
Casio Pro Trek WSD-F20 smartwatch review: Rugged watch for tough conditions
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Casio Pro Trek F30 smartwatch hits the trails in January - CNET
Casio Pro Trek Smart WSD-F30 smartwatch has a smaller case, better power management, and improved dual-layer display
