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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
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Amazon.com: Casio Men's PRO Trek Stainless Steel Quartz Watch with Resin Strap, Black, 23.5 (Model: PRW-6600Y-1A9CR) : Clothing, Shoes & Jewelry
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Amazon.com: Casio Men's Pro Trek PRW-3500T-7CR Tough Solar Triple Sensor Digital Sport Watch : Clothing, Shoes & Jewelry
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Casio Pro Trek Tough Solar Triple Sensor 52mm Analog-Digital Watch PRG-600-1CR : Clothing, Shoes & Jewelry - Amazon.com
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