There are a few things going on - there is a bit of wriggle room.
Through the design process, we noted how different each device was and how it reacted in different scenarios. We have found no two devices recorded the exact same readings. If you were to compare your 3rd party power device with the JetBlack VOLT™ EMS Smart Trainer the potential differences maybe influenced by the following factors:
- Data transmission Speed/Rate (signals sent at different intervals)
- Equipment tolerances
- Rider technique
- Wireless interference
- Temperature (airflow, heat within the unit compared to external device)
- Humidity
- Sensor location
- Calibration process
- Battery life