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Joyee on Twitter: "Check out Casio Protrek PRT-1 1840 The First GPS Watch with New Battery & Manual #Casio https://t.co/6Kt5lYL6Fd https://t.co/L5OPyRm3Fx" / Twitter
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Casio PRW 2500 ProTrek (module 3258) review & tutorial - guide on how to setup timing functions - YouTube
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