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A stylish GPS training companion with 24/7 activity tracking
Sports Watch with GPS.
For runners who want a sporty design with advanced GPS and training features, along with loads of options to keep an eye on their activity.
Silicone Wristband Strap for Polar M400 M430 GPS Sports Smart Watch Replacement Watchband Bracelet With tool Watch Strap Band - Price history & Review, AliExpress Seller - BEHUA Official Store
Polar M400 GPS Activity Tracker Sports Watch with Heart Rate Monitor Strap White
Upgraded my M400 today : r/Polarfitness
Polar M400 Review Tested by GearLab
User manual Polar M400 (English - 100 pages)
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 GPS & Activity Tracker Watch In-Depth Review
Polar M400 HR, black - Activity trackers - Photopoint
Polar launches M400 combined GPS watch and activity tracker + video