Have you paired the sensor?

• The sensor must be paired with Cateye Cycling™ or with smart computer.

​ Pairing a sensor or a Shimano DI2 system with the Cateye Cycling™ app

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The heart rate sensor may not be attached correctly.

• Refer to the heart rate sensor instruction manual and attach the heart rate sensor in the correct position.

* For information about the CATEYE sensor, refer to the sensor’s online manual.