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Casio Pro Trek Smart WSD-F30 smartwatch has a smaller case, better power management, and improved dual-layer display
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Casio "Pro Trek" Outdoor Heart-Rate Monitor GPS Sports Watch (Model WSD-F21HR-BKAGU) (BLACK) - Walmart.com
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Amazon.co.jp: Casio "Pro Trek" Outdoor Heart Rate Monitor GPS Sport Watch (Model WSD-F21HR-BKAGU), red : Sports & Outdoors
![Amazon.co.jp: Casio "Pro Trek" Outdoor Heart Rate Monitor GPS Sport Watch (Model WSD-F21HR-BKAGU), red : Sports & Outdoors Amazon.co.jp: Casio "Pro Trek" Outdoor Heart Rate Monitor GPS Sport Watch (Model WSD-F21HR-BKAGU), red : Sports & Outdoors](https://m.media-amazon.com/images/I/81NPBLbauWL._AC_UY1000_.jpg)