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The CASIO PRT-B50 is the first PRO TREK analog watch to have Smartphone Link and 4 environmental sensors - NotebookCheck.net News
My Eastern Watch Collection: Casio PROTREK Adventure Titanium Triple Sensor Ver. 3 PRW 3000 T7, A Continuation of the Super Tough DNA of a Casio Protrek, yet Capable of Doing More by
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