Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Set up your Polar M400 and Polar Flow App on Vimeo
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Polar - Hey Polar M400 iOS users! Smart notifications have arrived! Keep up-to-date wherever you want, with notifications about incoming calls and messages sent straight to your wrist! How to activate smart
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Polar Flow – Sync & Analyze - Apps on Google Play
Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339