Polar M400 update adds smartphone notifications - CNET
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Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
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Polar M400 angetestet: die Laufuhr nicht nur für Läufer - CURVED.de
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Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
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Amazon.com: Cable for Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 Review | Trusted Reviews
Polar M400 angetestet: die Laufuhr nicht nur für Läufer - CURVED.de
Polar M400 Review | PCMag
Compare Polar M400 vs Polar RS300X - Polar M400 vs Polar RS300X Comparison by Price, Specifications, Reviews & Features | Gadgets Now
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Polar M400 review | TechRadar
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