The declared detection range is 150-450 meters, and the device itself operates at 360 degrees.
Microphones are cheap devices and take very little power, I expect these kinds of detection networks to proliferate fast. While it will take an immense amount of microphones to create a dense network across the frontline, this turns fiber optic drone detection into a problem that can be tackled with scalable solutions using already established technologies and as such the material investment will be worth it.
It isn't hard to see where the applications and evolution in long endurance acoustic sensor networks will begin to develop, all war machines make noise including humans but I think once geophones start to be used to sense vibrations in the ground from moving equipment and troops in conjunction with acoustic sensors the battlefield will change irrevocably again, a new layer of acoustic transparency of enemy movements will layer on top of visual and radar transparency.
There is also no reason to expect that these sensors can't be dropped by a drone or even launched via some form of artillery/mortar to blanket an area. Additionally long endurance geophone and microphone monitoring networks will be necessary to detect hostile clandestine mining by enemy drones. Think about it, the mines dropped from drones are mass produced implements with a specific weight and character to the sound and seismic waves they would make landing on the ground. Even if they were placed with the utmost care, a high enough resolution ambient geophone sensor network may be able to detect changes in high frequency surface waves from large amounts of mines being placed in an area changing measurable aspects of the high frequency ambient wavefield.
An acoustic and seismic sensor emplaced and camouflaged could fulfill a wide variety of roles over time as battles occurred around them and in the radically vulnerable frontline of the Ukraine war the prospect of a motionless sensor that is never seen because it never moves becomes more and more appealing so long as it is cheap enough...
One has to wonder with the proliferation of Distributed Acoustic Sensing that can utilize pre-existing fiber optic networks to map the subsurface and measure seismic energy moving through it whether there was anyway you could similarly leverage the mess of fiber optic cables across the frontline.