[ZaoLahma]

From the article:

> And they don’t travel very far, so only nearby microphones would “hear” the tag. That makes the devices inherently private, Deng said, because other people wouldn’t detect any activity unless they were within a meter or so.

It would seem these things don't really produce loud noises, so probably not adding much to the noise pollution that already exists in our environments. At the same time it seems the statement kind of negates the "point" of this tech, that you don't need an active (energy consuming) device close to the source of the events that you want to detect. So not sure of how to interpret it.

[kaikai]

I’m interested in having an alarm for my door and the door to my workshop, which doesn’t have power. It would be great to have one “listening station” mounted on my home that can detect sounds from both devices. It’s not that I don’t have power available somewhere, it’s that I don’t have power available in EVERY place I’d want to use them, and don’t want to bother with a battery for every sensor.