Brian Gaff wrote:

Is it perhaps mini ground penetrating radar as used by some police
forces?
It is radar, they also don't seem to understand their target markets
very well, they're attempting to sell lower functionality versions with
fewer aerials, a narrower frequency range and higher price as bare PCBs
to hackers.

Don't they realise the hacker mindset will buy the cheaper boxed DIY
version, rip the PCB out and find a way to convince the board to
re-enable all frequencies?