Since this popped up i will add again.
I am now using the nate / buck rail inline chrony, it do not have BT but instead wifi, on the + side no APP needed and so umpteen people could connect to the chrono and follow me there.
I do have to power the inline chrono with a wire, but that is also fine but i have gotten one that is longer than the provided one CUZ my power bank are lying on the bench, and me changing distances and targets often mean the barrel do get moved around a bit, so need surplus wire.
Once hooked up i forget all about it.
The chrono use the voice in the devise, so i now get my speeds called out in burly Danish guttural / potato in mouth language.
My phone are fine still but i could also bring my laptop for a bigger screen, but then i would have to put that on the bench to my Left, where my friend will be shooting if i am not alone.
It would seem the issues my friend had with the FX V2 chrony,,,,,,, are solely phone related, at least now using a old android 7 phone of mine the chrono work fine on his rifles, though not yet tested on the DRS where the issues was biggest.
Anyway we swapped chronos so the V2 are now mine and he got my old V1 CUZ that work just fine on his DRS and with his android 13 phone from redmi
waiting for a silencer permit from the police, the buck rail chrono need to be quieted down a bit so we can hear the birds chirp while shooting in the shed.
Phone and PC chronoing ( poor sound on my PC im like where is my treble )