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The M-XXL Polar WearLink+ Coded Transmitter is designed to track heart rate with compatible Polar devices.


  • Size fits most adults
  • Compatible with all Polar products utilizing 5 kHz transmission technology (F4, RS100, RS300X, RS400)
  • Coded transmission eliminates cross-talk and interference when used with coded watch receivers
  • Soft fabric design for improved comfort
  • Built to last with up to 2500 hours of training usage
  • User replaceable battery
  • Original size that comes standard with Polar heart rate monitors, which use this transmitter belt style

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