Polar M400 GPS & Activity Tracker Watch In-Depth Review

Today, Polar has announced their latest watch, the M400.  This running focused GPS watch also contains day to day activity tracking (i.e. steps and sleep) along with smartphone connectivity.  The unit priced at $179US/€159EUR, is very competitively placed in the

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Polar M400 GPS & Activity Tracker Watch In-Depth Review

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