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ST 131 Piranha II

  • ST 131 Piranha II
  • Image 2
Call Us For The Best Prices! 1-949-791-7904


The ST 131 Piranha II is designed to find audio bugs that surreptitiously intercept audio conversations from the airwaves.

The ST 131 Piranha II detects any audio bugs that surreptitious intercept your information. Choose between two versions; the ST-131, or the ST-131N which detects nonlinear transfer in wire circuits.

The ST 131 is able to detect the following main types of devices:

Radio-emitting devices, particularly:

  • Radio microphones including devices for data storage and transmission (so called “impulse” STM) and for Frequency Hopping Spread Spectrum (FHSS)
  • Telephone re-transmitters
  • Radio stethoscopes
  • Video cameras equipped with radio transmitter
  • Unauthorized mobile telephones and modems of CDMA, GSM, UMTS, DECT standards as well as devices using digital transmission channels of WLAN and BLUETOOTH standards.
  • Devices that include devices designed for spatial high-frequency irradiation:
  • Radio beacon intended to track moving objects

Devices that transmit data through wire lines:

  • Field lines of AC main, subscriber telephone lines, lines of fire and burglar alarms
  • ST 131N identifies devices that transmit data within infrared frequency band.
  • ST 131N identifies devices that transmit data within ultrasonic frequency band

Devices that transmit data within infrared frequency band:

  • Multifunction detection device ST131 PIRANHA-II is intended for detection and localization of special technical means (STM) used for surreptitious obtaining of information, as well as identification of natural and artificial sources of information leakage.


The ST 131N is designed to detect the following natural and artificial information leakage channels:

Acoustic data transmission channel occurred :

  • as a result of acoustoelectric conversion (“microphonic effect”) in wire lines of different purposes
  • due to absence or lack of noise insulation in the examined premises.

The main types devices, for detection include the following:

  • Radio microphones including devices with storage and subsequent transfer of information (burst transmitter) and Frequency Hopping Spread Spectrum (FHSS);
  • Telephone radio broadcasting devices;
  • Radio stethoscopes; Video cameras equipped with radio transmitter
  • Video cameras equipped with radio transmitter
  • Unauthorized Mobile telephones and modems of CDMA, GSM, UMTS, DECT standards used without authorization;
  • Devices using digital channels of data transmission of WLAN and BLUETOOTH standards;
  • Radio beacons for object movement tracking.

The STM that use AC power, telephone, security and fire alarm lines for information transfer.
The STM characterized by information transmission in infra-red range.
The STM characterized by transmission of information in ultrasonic frequency range.


  • Digital signal processing module
  • Simultaneous processing frequency range, MHz 0.01-30
  • Input signal maximal level, dBm 5
  • Displayed noise level, dBm -100 (РС mode), -90 (main unit ST131)
  • Resolution ADC, bit  14
  • Number of FFT points 32768 (PC mode), 512 (main unit ST 131)
  • Filters sizes, МHz 0.001-6.8
  • Demodulation types АМ, FM, SSB, TV (АМ)
  • Identified data transfer standards GSM, WLAN, BLUETOOTH, DECT, UMTS, WiMAX
  • Detectors  Root-mean-square, peak, quasi-peak


Radio channel

  • UHF converter     
  • Frequency range, MHz 30-4300
  • Displayed noise level:
  • Within the whole bandwidth, dBm  
  • Within DDC bandwidth 1 kHz, dBm     
  • -80
  • -110
  • Input signal maximal level, dBm 5
  • Value of DDC bandwidth, MHz 224, 112, 54, 56, 28, 6.8, 2.5, 0.63, 0.15, 0.075,  0.04, 0.001, 0.0005
  • Sweep speed, GHz/sec, at least 10
  • SHF detector    
  • Frequency range, GHz 4-18
  • Threshold sensitivity, W/cm2 2x10-10
  • Dynamic range, dB 45
  • Type of antenna log-periodic
  • Antenna beamwidth, degrees  60-90


Wire line channel

  • Frequency range 1 (CH1), MHz 0.01-30
  • Frequency range 2 (CH3), KHz 0.3-15
  • Common-mode interference attenuation factor, dB 60
  • Absolute maximum input level, V 250


Optical channel

  • Spectral range, nm  770÷1600 (560-1100)
  • Detecting frequency range, KHz 0.1-1500
  • Dynamic range, dB  55


Acoustic channel

  • Frequency range, KHz 0.01-125
  • Dynamic range, dB 90
  • Input signal maximum level, V 1
  • Dimensions of main unit, mm 190x97x50
  • Indication TFT, 3.5"
  • 240x320 resolution, 65K colors
  • Interface USB 2.0 (200 МBit/sec transfer speed)
  • Power supply 6 AA batteries (rechargeable batteries) or
  • 100-240 VAC, 50-60 Hz



  • Main unit;
  • UHF converter (ST131.UHF);
  • Broadband UHF antenna (ST131.UHF.A);
  • Wire line adapter (ST131.AWL);
  • Leads;
  • Main unit supporting block;
  • Main unit shoulder holder;
  • Headphones;
  • Tripod;
  • 2 power supply units;
  • 8 AA batteries;
  • CD with software;


Right click to download the manual for the ST 131 PIRANHA-II.

Warranty Information

EyeSpyPro guarantees this product for 90 days from date of purchase. If the manufacturer offers a longer warranty, we will assist you in obtaining repairs under warranty. Contact us for the manufacturers warranty for this product.

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