This inductive amplifier also converts all sorts of other EM fields generated by most electronic equipment into audible noises. CPUs, logic circuits, etc. will be heard as 'tick tick buzzzzz tick buzzz' or similar clicks and squeals. One big caveat is that the range of most EM fields picked-up is only maybe a foot or so. But if you were to run a probe up and down a wall or around objects you suspect might contain a recording device, you'd likely hear it.
This isn't the only tool I'd use, but it's a quick and easy way to get a basic idea of what might be hiding.
Basic version is free and will tell you what's connected to your network. Haven't been in a rental property in years but I constantly use it just out of curiosity, in bars, coworking spaces etc.
The app will tell you the IPs of all connected devices and you can do port scans as well (nmap is better but less convenient). One time I managed to access the router of a coffee shop while waiting for my drink using default credentials, and from there got the video feeds of their security cameras.
Network scanning won’t work for most commercial/guest WiFi systems like you’d see in a hotel, because they use client isolation which prevents your device from communicating with anything but the default gateway and maybe a DNS server. But it should work on most standard networks like what you’d find at a typical Airbnb rental.
doesn't that only work if the spying devices are on the same network? to detect all wireless devices you need something like wireshark + wireless adapter than can be put into monitor mode.
https://www.independent.co.uk/travel/news-and-advice/airbnb-...