An advanced heart rate transmitter belt for the Garmin Forerunner 620 which gives additional data to your watch thanks to built in accelerometer technology passing on oscillations & movements. A heart rate transmitter with additional features providing real-time feedback on running form By sensing torso movement running form metrics can be computed Cadence, ground contact time & vertical oscillation are all calculated & sent direct to your FR620 Requires pairing with the Forerunner 620 to utilise all features of this heart rate transmitter