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The power light indicates that the FlashPro has power, either from USB or from the diagnostic connector.
The program light indicates that the FlashPro is re-programming the vehicle ECU.
The datalog light either indicates the FlashPro is datalogging or indicates USB activity.
The USB light indicates a valid USB connection.
The program button initiates the re-programming of the vehicle ECU. See Uploading a Calibration
The datalog button starts and stops datalogging from the vehicle. See On board datalogging