The controller of the modified DJI Smart Controller/RC PRO can be

The remote control of the modified DJI Smart Controller/RC PRO. Extend the signal port outside the remote control, you can install and connect an external ALIENTECH antenna signal booster for long-range extend.
The remote control of the modified DJI Smart controller/RC PRO. Extend the signal port outside the remote control; you can install and connect an external ALIENTECH antenna signal booster for a long-range extend. Due to the limited supply of this product, the delivery period is usually 1-2 weeks.

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