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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.co.jp: RuenTech Bands Compatible for Polar M400 Watch Strap Replacement Soft Silicone Wristband Sports Band Compatible with Polar M400 and M430 GPS Smart Sports Watch-Orange M(5.5''-8.0'') : 家電&カメラ
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