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Casio is adding a new model to its Pro Trek Smart series with the reveal of the WSD-F21HR. The new model adds a heart rate monitor and makes it the first Pro-Trek to feature an optical sensor. The watch features built-in GPS, Wear OS by Google, a 1.32-inch, dual layer touchscreen display, 50M water resistance, virtually all the sensors you could ever need in an outdoor watch, running and trail modes, and up to a month's worth of battery life without GPS enabled.


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