Garmin Heart Rate Monitor for Forerunner 50 & 405

This digital heart rate monitor continuously tracks heart beats per minute which is wirelessly transmitted to the Forerunner 50. Effectively tracks and records your heart rate while you work out, providing instant feedback about how hard your heart is working. Even train in a certain heart rate zone to improve your fitness level! For Garmin Forerunner 50 and Forerunner 405 ONLY.