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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
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Amazon.com: kwmobile TPU Silicone Strap Compatible with Polar M400 / M430 - Tracker Band - Camouflage Dark Grey/Black/Light Grey : Electronics
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Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
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Polar M400 Activity Tracker/GPS Running Watch With Heart Rate Sensor! | Gadget Explained - Reviews Gadgets Electronics Tech
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