Countersurveillance technologies
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All-round ultrasonic jammer SEL-360

SEL-360  is a small size microphone (including cell phone microphones) and audio recorder jammer with round-shaped jamming pattern for use on top of or under tables, desks or similar surfaces during meetings.

SEL-360 is a high-power and efficient microphone jamming device due to it's thought-out design, that includes high-quality directional ultrasonic transducer array that pushes a complex, tailor-made noise waveform on a frequency band that is below human hearing point, but right in the zone of common audio microphone bandwidth, applying a constant noise pressure on the microphone's membrane.

Ultrasonic transducers in the SEL-360 suppressor are installed in a circular array, providing reliable jamming in all directions around the device, which makes it a perfect choice for securing meeting tables and desks.


  • An array of 48 high-quality piezo-ceramic transducers, installed in a circular shape inside a drum-like unit, controlled by a microchip that automatically shifts the noise signal in time and frequency domains, achieving best possible jamming efficiency and rendering any actual speech signal on the microphone unintelligible.
  • Flexible power supply: device can draw power either from the 220V mains or from a built-in Li-Pol battery, with capacity enough for 3 hours of continuous operation.
  • Easy to use control: can be turned on/off via a button switch on the device, or wirelessly with a special RF remote control.
  • Indicator dashboard: device constantly gathers self-diagnostic and battery charge data and outputs it to an easy-to read LED indicator dashboard on the bottom panel of the device.

SEL-360 standard package contents:

  • SEL-360 jammer, black color finish;
  • Power supply adapter for 220V mains;
  • RF remote control with spare CR2032 battery;
  • Owner's manual;
  • Cardboard shipping box.
Generated noise frequency bandwidth 24 - 26 kHz
Number of ultrasonic transducers 48 pcs
Jamming direction omnidirectional (360°)
On/off switch button or RF remote control
Average effective jamming range 4 meters *
Operation time from battery not less than 3 hours
Time to fully charge battery not more than 3 hours
Case material plastic
Overall dimensions D 160 х 65 mm
Weight not more than 800 g
Operating temperatures from 0 to +50 °C

* Effective jamming range may vary based on type of microphone of the audio device and its relative position to the jammer.