1. Please check whether the mode of the S3+ is correct.
When the battery is installed, the red light flashes to indicate that it is in cadence mode. If the mode does not correspond to cadence, the data will be abnormal.
If the sensor is connected to a bike computer, please make sure the mode of the sensor is correct, then forget the sensor on the bike computer, and connect again.
2. Maybe a compatibility issue.
Please try to connect the sensor to Magene Utility APP, then see if the speed data will display.
3. Please make sure the cadence data is within the detectable range.
The range of cadence that can be detected is 30-160. If it is in a low cadence state, the data will become 0.
4. Make sure there are no magnetic fields around.
The sensor uses geomagnetic sensor measurement data, if there are any magnetic fields around, the data will be affected.