Use this module to connect UART TTL interface on MWC fight controller so that you can: Read & modify all PID data; Read & modify AUX1/AUX2 switch setting; Monitor controller signal; Monitor the output signal of GPS and sensors (such as gyroscope accelerometer barometer magnetic resistance etc); Correct the magnetic resistance and accelerometer; Read and save MWC data in moile phone; Shot screen. FTDI can not be used simultaneously when this bluetooth module is connected since both of them share one UART interface. LED indicator: Green: power indicator it will be steady on when this module is turned on; Red: flickering means the module is disconnected steady means it is connected.