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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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Wrist Band Silicone Watch Cover For Polar M400 M430 Strap Bracelet Replacement Watchband For Polar M430 Frame Protective Case - Smart Accessories - AliExpress
![Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/419sqK-UP8L.jpg)