Go to Settings> Bluetooth> Heart Rate Belt and select your heart rate monitor. Nyon will connect to your heart rate monitor. The active connection to the heart rate monitor is represented by the white heart symbol on the main screen. If you have activated a Bluetooth-enabled heart rate monitor, your heart rate will be displayed in the centre of the screen instead of the pedal power in "Fitness" operating mode.
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Further information and instructions for use can be found in the corresponding owner's manual.