Portable Ultrasonic Microphone Defeater

(3 reviews) Write a Review
MSRP: $999.99
Was: $999.99
Now: $969.99
(You save $30.00 )
Battery Life:
1 Hour (Unless Powered)
Up to 5 meters
Power Bank:
The unit doubles as a functioning USB power bank
These units are built to order so may take up to 4 weeks for shipping and processing times
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Product Overview

  • The ultrasonic effect on the microphones of recording devices makes it impossible to listen to and record human speech on voice recorders and portable devices, even with ultra-sensitive microphones.
  • Functional as a charging device. In addition to the audio blocking function, the defeater can be used as a normal power bank to charge 5 volt USB devices, phones, tablets, smartphones.
  • Autonomous operation of up to 1 hour allows using the defeater where there is no 220V connection available.
  • The unit is directional, this means that the speakers that emit the ultrasonic frequency need to be facing the area you are trying to block out.
  • Quiet operation. The ultrasonic noise generated by the defeater is invisible to the interlocutor.

Availability: This item is built to order so please allow an extra 2-4 weeks for shipping and processing times.



Q: Does this unit jam signals? 
A: No, this unit is not a jammer. It only interferes with microphones so you cannot be recorded or listened in on. 

Q: Does this unit make sound? 
A: Most humans cannot hear the ultrasonic frequency but the microphones can.


  • System Compatibility: Windows Vista, 7, 8, 10
  • USB Port
  • Windows Compatible Sound Card
  • Net Framework version 4.6.1
  • Internet Connection for Some Features

Product Videos


(3 reviews) Write a Review

3 Reviews Hide Reviews Show Reviews

  • 5
    Finally a Silent Microphone Cancelling System

    Posted by Sammy S on Oct 6th 2019

    I love this device. Makes a microphone useless.

  • 5
    Secretive device

    Posted by Pedro L. on Sep 4th 2019

    Works well cancelling out microphones. Tested a few times and i really couldn't hear anything.

  • 5
    Works just as described

    Posted by Sally Walker on Sep 4th 2019

    This item works just like the demo videos show. I used my phone to record a test video and couldnt hear myself talking at all!