Had this explained once, I might miss a detail, but it’s like this:
The only way not to drain your battery is to program in selective key words.
“But then its always listening” yes, but also, no.
Imagine someone speaking into a microphone, and seeing their voice bounce around on a oscilloscope.
This compresses the audio a LOT, and makes it very difficult to discern the differences between words.
But if you were trained to notice the pattern for a specific word, like “Siri”, then you could ignore all the other shapes, conserving your battery.
Can you elaborate more? I’m under the impression space is very cold, and the heat would get sucked out like I wish I was, at least once before I eat shit.