Meet the Delta X 100/6 Spectrum Analyzer: a system for detecting signals in real-time, allowing you to identify RF listening devices, with or without encryption. You can use it to find hidden listening devices using GSM, 3G, 4G/LTE, Bluetooth, WiFi, and other technologies.
The system works in instant detection, guarding, and other modes. It can log data for 24 hours and has a software to help you make sense of all the data.
[where to get it]