Detection of radio waves with 5-Levels sensitivity ... car trackers, cell phone spy software, wireless pinhole cameras, surveillance cameras, casino fraud, and cheating devices.

Spy 1 is the world's smallest detector offering inconspicuous protection for corridors and passageways as well as control of CCTV, access control and similar systems. It can be flush-mounted in a wall ...

However, it's not compatible with Chromebooks. The Koilboane Hidden-Camera-Detectors, Anti-Spy Camera Detector Bug Detector, ...

That’s the premise behind [RamboRogers]’ RF hunter, the spy movie electronic scanner made real. At the rear of the device is an ESP32, but the front end is an AD8317 RF detector chip.