Polar - Runners! Stride sensor support for Polar M400 is here. We've also improved the GPS fix! Learn more: http://bit.ly/1GJC6jr | Facebook
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Amazon.com: RuenTech Bands for Polar M400 / M430 watch Strap Replacement Soft Silicone Wristband Sports Band For Polar M400 and M430 Smart Sports Watch-Black L(5.5''-9.0'') : Electronics
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