Polar M400 watch not pairing with H7 Heart Rate Sensor (chest strap) : r/Polarfitness
User manual Polar M400 (English - 100 pages)
Polar M400 GPS Sports Watch without Heart Rate Monitor, Black : Amazon.ca: Electronics
Amazon.com: Polar Pacer Pro - Advanced GPS Sports Watch, Wrist Heart Rate Monitor, Smart Watch for Men and Women, Workout Running Watch, Training Program & Health Recovery Tools, Sleep Monitor & Activity