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
Polar M400: Running and activity tracking in one (pictures) - CNET
Polar M600 review - Android Authority
Polar M400 GPS & Activity Tracker Watch In-Depth Review
Polar M400 GPS & Activity Tracker Watch In-Depth Review
Polar M400 Review
Polar M400 Review Tested by GearLab
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M430 review
Review: Polar M400 Fitness Tracker Watch
Used but works great
POLAR M400 watch, integrated gps, activity tracker, White With Charger
User manual Polar M400 (English - 100 pages)
Polar M400 GPS Smart Sports Watch with Heart Rate Monitor (Pink) : Sports & Outdoors