Garmin Comfort chest belt.
For use with Concept2 PM5s, PM4s, PM3s, PM2+s and PM2s. Polar H7 Bluetooth Smart chest belt for displaying heart rate data on the Performance Monitor.
For use with the SkiErg and Dynamic Indoor Rower. Enables heart rate monitoring on your PM3 or PM4 with Polar equipment you already own.
If you already own a Polar™ or Polar compatible heart rate chest belt transmitter and would like to enable the PM2/PM2+/PM3/PM4 heart rate monitoring function on your Concept2 Model A, B, C, D, or E Indoor Rower, this Concept2 Heart Rate Receiver is what you need.