Similar for smoke alarms, they have devices that essentially “listen” for specific sounds/frequencies and will then flash (AVC or audio-visual conversion) when triggered. Essentially “if this is flashing, the house is likely burning down”.
Increased visual awareness is just “they pay more attention to this sense due to lacking another” rather than the stereotypical “Im blind but I can see sounds” like daredevil. It would be interesting to see if it is actually quantified or captured by studies though.