One of the cool features of FuriousFPV gear is that they have a pluggable Bluetooth module and companion app (IOS/Android) that let you configure your various devices remotely.
FurousFPV Bluetooth Module Device Compatibility
There are a load of different Bluetooth modules available that can make buying one very confusing. But the truth is they are all largely the same module with different baud rates for the various devices. But when you look at the details it boils down to two baud rates as shown in the table below. So depending on what device you plan you use you can buy the appropriate one. The VTX units all run on 115200 and this means the bluetooth module is interchangeable between them. The F-35 uses a slower baud rate so there is a separate module for this.
If you plan to connect your bluetooth module directly to your FC, then you can use any one. Just set the correct baud rate in Betaflight.