@Jerome
I wasn’t trying to be harsh, and I apologize if it came across that way. If you think it’s a listening device, you could buy a bug detector online and scan for anything unusual.
From my experience working with private investigators and digital forensics, most of the time people think they’re being spied on, it’s just paranoia. But I can’t rule anything out without seeing your setup.
If you’re sure something’s going on, buy a cheap scanner, cover your webcam, and turn off your devices when not in use. Test it for a week and see if anything changes.