FIRST LISTENING DEVICE - THE THING
The Thing , also known as the Great Seal Bug, It was one of the first eavesdroppers (or "bugs") to use passive techniques to transmit the audio signal. It was hidden inside a gift given to W. Averell Harriman by the Soviet Union.
WHAT IS A NONLINEAR DETECTOR?
(NLJD - NON LINEAR JUNCTION DETECTOR)
Non-linear detectors ( NLJD ) are professional insect detection and insect search devices designed for the search and detection of eavesdropping devices, transmitters consisting of various electronic devices and semiconductors.
NEW ANTENNA STRUCTURE - PROTECT 1206i IN OUR STOCK...
Analogue and digital based insect search and detection device "Protect 1206i" has been renewed. With its easy-to-use and directional antenna, you will be able to detect the exact location of insect listening devices.
"PROTECT 1206i", the best-selling analog and digital frequency signal analysis, insect detection, insect detection and signal detection device in Europe and America, is in our stocks...