system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is the sound of a blinker made?

A tiny speaker? A sound chip? Something mechanical?
gpt
It used to be a relay that was purposefully noisy to remind you it's on. 
I would say in the last 5 years it has been mainstream that all lights are controled by a computer so now the sound is from a speaker and a computer decide if the blinker sound should ring or the safety belt warning or the door open or other warnings.