The rabbler noise generator MNG3000 generates audible voice compilations to mask any conversations taking place. The MNG3000 will protect against but is not limited to voice recorders, radio microphones, GSM/3G “bugs” and wired microphones. This unit will operate at a frequency between 300 Hz ~ 3600 Hz. The MNG3000 will operate for up to 10hrs with a single 9v battery. The unit measures 85x53x21 mm. This unit is not a wireless frequency jammer, those type of devices are highly illegal (as noted here) and not available for purchase. Be sure to check out the rest of our audio jammers & noise generators.
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I tested this and really scrambles a microphone so much that it makes the recorder useless. It's audible but works.
Love that its actually able to fit in my pocket