Portable noise generator

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 Portable, can be prepared for usage within a second Has a durable case Powered by one 9V battery The MNG-3000 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.