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.

for DJI RC Pro/Plus Lanyard T40 T30 Smart Controller Wide Strap Transmitter PU Hanging Rope for DJI Mavic 3/2/Mini 3 Pro Drone - AliExpress

DJI RC Pro Smart Controller Professional-Level Aerial for DJI Mavic 3 /Air 2S With The Powerful o3+ Video Transmission In Stock - AliExpress

DJI Mini 3 Pro In-Depth Review (Including Sports Tracking)

Best DJI Drone Controller: DJI RC Pro vs DJI RC vs DJI RC-N1 vs DJI Smart Controller – heliguy™

What controller setup do you use? : r/dji

The Perfect Drone For Photographers

DJI RC Remote Controller with Built-In 5.5 FHD Screen (for DJI Air 2S - DJI Mini 3 Pro & DJI Mavic 3 Drone) - Buy Online - Heathcotes

DJI Smart Controller With Built In Ultra Bright HD Screen Announced

Review - DJI Mini 3 Pro — Samuel Scicluna Photography