1- Please check if the insulating sheet under the battery has removed. If there is an insulating sheet under the battery, you need to remove it then reinstall the battery, or the sensor will not work.

2- If you use the cadence sensor with a fitness app, please be informed that it can be only added in the Fitness APP via Bluetooth, if you pair it directly via BLE from your smart device, then It will not work properly.
RECOMMEND APPS: Wahoo Fitness, Openrider, iCardio, Zwift, Elite HRV, Endomondo, Peloton, etc.

3- You can also pair it directly with your bike computer or other smart devices via ANT+, no need for a fitness app.

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