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The Pro Trek WSDF21HRRD and WSDF21HRBK smartwatches include a heart rate monitor Casio announced the new Pro Trek Smart WSDF21HR smartwatch featuring a wristbased heart rate monitor This allnewThe Casio ProTrek WSDF21HR has a 132" inch dual layer color TFT LCD with 3 x 300 pixel resolution To save power it has a monochrome LCD to provide basic information without using too much power The display is touch screen with antifouling coating It is a smart feature giving the smartwatch added battery lifeThe Casio Pro Trek Smart WSD F21HR is the digital watchmaking giant's latest outdoor smartwatch that once again runs on Google's Wear OS operating system We're now into multiple iterations of the Pro Trek smartwatch and while it has vastly improved as an adventure companion over time, there are some aspects of the watch series we've remained critical of 3 Pack For Casio Pro Trek Smart Wsd F21hr Screen Protector 9h Tempered Glass 2 5d Scratch Proof Explosion Proof Protecti