How to Change Date and Time on POLAR M400

How to Change Date and Time Format on POLAR M400

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New Super Watch, Polar M400, Rocks My Fitness World - PfitBlog

New Super Watch, Polar M400, Rocks My Fitness World - PfitBlog

Polar M400 User Manual

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Polar M400 Watch Wrist Strap Replacement - iFixit Repair Guide

Polar M400 Watch Repair - iFixit

Polar M400 GPS Smart Sports Watch with Heart Rate Monitor (Blue) : : Sports, Fitness & Outdoors