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HRM-Tri and HRM-Swim are the smallest and lightest heart rate monitors from Garmin.

• HRM-Tri and HRM-Swim are the smallest and lightest heart rate monitors from Garmin.
• HRM-Tri
  – Designed for running, biking, and open water swimming
  – Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible device at the end of the session. Sends real-time heart rate to the watch when the monitor is out of the water
  – Provides feedback on running form by measuring cadence, vertical oscillation and ground contact time when paired with a compatible device
• HRM-Swim
  – Designed for pool swimming, but is good for multi-sport activities involving a pool swim.
  – Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible device at the end of the session. It also sends real-time heart rate and interval summaries to the watch when the monitor is out of the water during rests