He good morning Greg
So yes the Link system is 2,4 ghz as you describe and that the video is 5.8 Ghz. The receiver is a UVC receiver, meaning its USB connected to the tablet or phone. Most people are using the Skydroid version of the tower app. They use it because it’s been modified to support UVC video.
The standard Tower app or the Mission Maker version both crash when using UVC video…at least that’s most peoples experience.
Mission Planner on Windows will also work with UVC but of course Android tablets are the easiest to find.
Of the three units you point out. M12 and M12HD are not available. The M12 is a lower range version of the M12L and the M12HD is the video inclusive version albeit at a lower range. The M12HD replicates in a lot of ways the DJI Mavic like experience with no add on hardware. However it’s also not available at this time.
there are a couple other version that are out there. But I have yet to get an answer from Cao as to when we can get our hands on them lol
The unit in the foreground is an video inclusive device. It resembles the DJI Phantom controller in a lot of ways.
Please note I don’t work for Skydroid. I am an early adopter, one of the first to get my hands on the unit and I have a friendly relationship with Cao who runs the part of Quanzhou Yunzhuo Electronic Technology Co that is responsible for the Skydroid system.
Hope this helps, feel free to shoot any questions you have. This group is very supportive.
PS
@Tom-fly or @cala2 are the closest to testing the 60km range assertion that Skydroid has made. @Tom-fly is the current record holder of 17KM.