[greggold]

This is an interesting development, however bear in mind that the 868/915 frequencies are not legal for use in RC in Australia.

We can use 915 to 928MHz but I don't think the new modules support that.

I think 868/915 mhz means that in some areas eg EU you use 868 band and in others eg Aust. you use the 915 band. I expect it is allowed. if you select 915 mhz (called the low band) for both tx emissions, the 2   915 signals may differ in frequency by a small amount.  The above Bardwell video that I just found (and added to the above post) is the best explanation of gemini X, and in particular explains why it would be relevant for someone who one day uses 2.4 Ghz and on another day wants to use the low band, or wants to use the new module with their existing elrs rxs.