Bug scanner - ST-403 Cayman for non linear junctions detection from Selcom Movie
Bug scanner - ST-403 Cayman for non linear  junctions detection from Selcom

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Bug scanner - ST-403 Cayman for non linear junctions detection from Selcom

  • Handy, lightweight and small-size
  • Frequency range 2-3 GHz
  • Actuating signal power 2 W
  • Operation modes search and adaptation
  • Graphical detection display



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Bug scanner ST-403 Cayman – detector of non linear junctions from Selcom

ST-403 "Cayman" is the best bug scanner available on the market. It is a miniature version of the popular series of detectors capable of finding even the smallest surveillance devices of all kinds. The bug scanner is truly unique while carrying out regular searching of rooms and before important meetings.

  • Results display

    Results display



  • Work time

    Operation time of the bug scanner

    do 4 h

  • Detection range



  • Range of frequencies

    Frequency range

    2-3 GHz

Operation of the bug scanner is based on the feature that is common for all semi-conductor circuits i.e. actuation with an electro-magnetic signal which enforces emission of both the 2nd and 3rd harmonic of the signal and depending on the type of the semi-conductor the actuation signals can be stronger for the 2nd or 3rd harmonics. Transistors, diodes, integrated circuits generate stronger response to 2nd harmonic of the actuating signal, while the natural oxidation will generate stringer signal at 3rd harmonics of the actuating signal. The bug scanner enables it to analyse the responses of both 2nd and 3rd harmonics of the actuating signal, which makes it possible to precisely identify all kinds of electronic devices and natural oxide semiconductors. Additionally, the ST-403 „Cayman” bug scanner shows the signal strength reflected from the metal parts.

The ST-403 NLJD bug scanneris able to detect:

  • SIM cards
  • digital and analogue radio wiretaps
  • wireless microphones
  • wireless and recording micro video cameras
  • microwave transmitters
  • wireless wiretaps, transmitters and receivers
  • active and deactivated sound recorders
  • explosive charge detonators
  • mobile phones
  • GPS locators
  • several other types of devices containing electronics

Owing to multifrequency actuating signal in 2-3 GHz band, the device is able to detect and locate even small devices such as SIM cards. The appearance of false alarms has been reduced thanks to the fast signal processing algorithm. New design of the elliptic antenna allows to achieve high sensitivity with relatively low intensity of the actuating signal. Upon detection of a signal device emits an audible signal whose volume can be adjusted.

Contrary to the model ST-402, ST-403 is smaller, neater and lighter as the telescopic beam has been reduced. The 403 model has been designed first of all for at-hand operation. The device is powered by Li-Ion 18650 rechargable batteries and the whole set is enclosed in a portable case resistant to weather conditions.

Key features of the bug scanner 'Cayman'

  • detection and location of electronic devices (regardless of the applied technology) - wiretaps, video cameras, mobile phones, SIM cards, chip cards and many others,
  • multifrequency actuation mode in 2-3 GHz band allows to detect very small electronic components such as SIM cards,
  • enhanced selectivity and ability to distinguish electronic components from natural background of metal-oxide-metal connectors e.g. rust),
  • enhanced probability of detecting partially shielded devices e.g. wall reinforcement,
  • low output signal power with optimized sensitivity of detection,
  • highly effective work against interference (corrosion, reinforced structures, etc.),
  • minimized rate of false alarms and increased speed of operation owing to advanced signal processing and analysing algorithms,
  • additional ability to identify an object by sound signal analysis,
  • modernized design of the elliptic antenna which has improved the device effectiveness,
  • easy to use and does not require special technical knowledge,
  • the display integrated with the antenna within the operator’s sight,
  • ergonomic design, light weight and small size,
  • using standard rechargeable batteries type 18650
  • the software of the device can be updated via the USB connection,

Product video


Selcom Security

Selcom Security is an exporter of Russian products designed for detecting spy appliances and conducting audio and video supervision . The company offers a wide scope of professional products such as bugs, frequency scanners, camera detectors, noise generators or voice...


­Specification of the bug scanner for detection of non-linear junctions ST-403 "Cayman"
1 5 steps for 8 dB 2 red – electronics, blue – metal-oxide-metal joint for example rust, white – reflection of the signal from the metal surface 3depending on the settings
Frequency of the ignition signal2-3 GHz
Maximum power of the ignition signal2 W
Operation modes
  • search
  • adaptation
Range of the manual adjustment of the ignition signal40 dB 1
Results presentation
  • graphic - 16 level indicators 2
  • automatic frequency selection for minimum noise level
  • sound – built-in speaker or headphones
Operation time of the bug scannerup to 4 h 3
Charging time3 h
Power supply2× 18650 3,7 V batteries
Operation temperature of the bug scanner+5 up to +40°C
Admissible humidity+5 up to +40°C
Dimensions340 × 130 × 160 mm
  • with batteries: 850 g
  • set: 3,7 kg


  • Bug scanner for non-linear junctions ST-403 "Cayman"
  • 4 batteries 18650 Li-Ion 3,7 V
  • Charger
  • Connection cable
  • Headphones
  • 2 test objects
  • Anti-shock transport case
  • User manual


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