User manual Polar M400 HR (English - 96 pages)
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Maintenance of your M400 | Polar Canada
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Polar Announces A300 Activity Tracker Watch, also MyFitnessPal automatic sync support | DC Rainmaker
How to open / disassembly Polar M430 for battery replacement - YouTube
Polar M400 Battery replacement - Smartwatch - iFixit
Polar M400 Watch Battery Replacement - iFixit Repair Guide
