DJI Mavic 2 - https://amzn.to/2CeMfqi

DJI Phantom 4 - https://amzn.to/2RJd8wi

DJI Spark - https://amzn.to/2CcaANE

DJI Mavic Air - https://amzn.to/2VJA3H6

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How to link the transmitter (rc r/c radio controller remote control) to the drone / quadcopter / aircraft by using the "linking rc" feature on the DJI Go app. It is located on the right side of the drone just behind the camera and gimbal assembly. The button is in front of the small led light that is flashing green and red in the video.

I had to "link" my rc to the drone again after the most recent r/c software upgrade in July 2017.