Go to Settings (see FAQ "How do I access the on-board computer settings?") and activate Bluetooth. An automatic search takes place for heart rate monitors within range. Select the required heart rate monitor to connect to it. The active connection to the heart rate monitor can be recognised by the white heart symbol in the Status screen. If you have activated a Bluetooth-enabled heart rate monitor, the heart rate will be displayed on a screen.
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Further information and instructions for use can be found in the corresponding owner's manual.