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From Russia With Love Gadgets
The first thing any good spy will want to do when checking into his hotel room will be to check for listening devices.
To do this you will need a bug detector.
There are a wide variety of Bug Detection and Listening Devices. This Detective Pen is used for finding audio bugs and mobile's broadcasting within a 1 to 10 meter vicinity. The Pen's unique design makes it flash faster and faster the closer you are to the transmitting bug or mobile.
Technical Surveillance Counter Measures
Electronic Counter Surveillance is another technical description. To most of us, the phrase would be Bug Detection.
As most bugs operate by emitting radio frequencies, a bug detector is simply a radio frequency receiver.