How are they doing it though? Full transcription is really difficult to do at the edge on battery power. It's either bandwith heavy or CPU heavy. Both of which

How are they doing it though? Full transcription is really difficult to do at the edge on battery power. It's either bandwith heavy or CPU heavy. Both of which nail the battery. The only really practical way I can see it being done is with keyword tracking, and then recording snippets either side. But that still takes a reasonable amount of power to do.