The Stealth MNG-300

The Portable White Acoustic Noise Generator

The Stealth MNG-300 Skeller generates white acoustic noise in the speech frequency range of 250-4500 Hertz. Sound interference is put onto the recording and makes its quality worse. Due to a uniform distribution of white noise along the whole sound range, clearance of the obtained recording is impossible. The unit should be placed near the designated person to be protected. A digital-analog synthesizer is used to produce the noise.

The Stealth MNG-300 will improve the security of your important conversation such as a business negotiation and protect you against listening and recording devices. When it is used in the correct manner, the Stealth MNC-300 Skeller will protect you from:

  • Voice Recorders(tape and digital type)
  • Microphones, Wireless Microphoness
  • Stethoscopes, laser window stethoscopes
  • GSM-transmitters, etc.


The Stealth MNG-300 creates a additional barrier interference which masks your speech, when a certain noise level is reached a listening device which can record or transmit the information. It is extremely dificult or impossible to extract the speech component fromthe noise. Since the generator creates a "white noise" which is distributed throughout the speech range of spectrum of human voice, cleaning of the noise is not possible if the level of noise is sufficient.

- Decreases efficiency of voice recorders (intelligibility drops by 90%)
- Influences radio microphones and stethoscopes with an efficiency of up to 95%
- Absolutely harmless to your health: no electromagnetic or ultrasound radiation
- Frequency response: 250~4500 Hz
- Portable: can be prepared for usage within a second 2.7x5.5x8.6 cm
- Has a durable case with a leather pouch
- Powered by one 9V battery


* MNG-300+ : Voice activaing Portable Digital White Noise Generator.


Principal of work

White noise

Frequency response

250-4500 Hz


2.7 x 5.5 x 8.6 cm


Power on/off, Volume


Power, Volume (10 segments)

Supplied set

Unit, leather case, battery, user manual


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