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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 Cloth Strap, Green, 30.5 (Model: PRG-600YB-3CR) : Clothing, Shoes & Jewelry
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Amazon.com: Casio Men's PRW-6600Y-2CR Pro Trek Analog-Digital Display Quartz Black/Blue Watch : Clothing, Shoes & Jewelry
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