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Amazon.com: POLAR Grit X Pro - GPS Multisport Smartwatch - Military Durability, Sapphire Glass, Wrist-Based Heart Rate, Long Battery Life, Navigation ,

Amazon.com: POLAR Grit X Pro Titan - Premium Outdoor GPS Sports Watch - Military-Durability, Sapphire Glass, Wrist-Based Heart Rate Monitor, Ultra-Long Battery, Navigation - Trail Running, Mountain Biking, M/L : Electronics,

POLAR Grit X Pro Titan - Premium Outdoor GPS Sports Watch - Military-Durability, Sapphire Glass, Wrist-Based Heart Rate Monitor, Ultra-Long Battery, ,

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