Yeah. It is a shockingly easy problem to solve. The point is more what the hardware is designed to listen for.

Drones? A quadrotor big enough to handle a... paint balloon is not that big. That is why so many dumbass russians don't hear it until it is too late in Ukraine. So you need a fairly sensitive mic and the hardware to filter through all the background noise.

Gunshots? You COULD rig something up to do similar so you can hear a gunshot from a mile away but there really isn't a point since that wouldn't be actionable data for the real customers (cowardly cops who want to run the other way). And you want to sell a LOT of these because triangulation obviously means square mile because said customers don't understand trigonometry. So you want to focus on loud noises and be able to distinguish a gunshot from a car backfiring from fireworks. So relatively low sensitivity mics and hardware more geared towards that.

Which, when you are re-purposing them for surveillance, are very different tools.