Protect Private Conversations

The Portable Masking Kit (PMK-8) protects private conversations by injecting voice masking noise into structural surfaces, gaps, and free space, making conversations unintelligible.  Portable Masking Kit creates a perimeter of masking noise that defeats acoustic leakage and eavesdropping devices like:

  • Wired wall devices
  • Contact microphones
  • Hidden audio transmitters
  • Laser/reflections from windows

Efficiency: This kit provides a temporary audio security solution when you need to get in, set up voice masking security, and get out.

Usability: Create a Voice Masking perimeter to protect against structure bound audio threats

Portability: The Portable Masking Kit, PMK-8 packs 8 Voice Masking Generator sets (unit, transducers, cables) in a hard shell case for easy transport with wireless charging in the case.

PMK-8 expected ship date October.  

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  • Quick deployment – easy to configure/setup
  • Portable – packs in a case for easy transport
  • Protects against structure bound audio leakage
  • Compact – each small Voice Masking Generator powers 2 transducers
  • 24 speakers total (16 transducers, 8 internal VMG speakers)
  • Load custom voice recordings to match those speaking in the room
  • 24 hour battery life
  • 4W external speaker output
  • Line out
  • Rechargeable lithium-ion battery
  • Multiple mounting options
  • 32 GB memory for storing custom audio files
  • Selectable HVAC or scrambled speech/custom audio output
  • Adjustable output volume
  • Inductive wireless charging built into case


  • Hotel Rooms, offices, conference rooms
  • Technical Surveillance Countermeasures (TSCM)
  • Speech and conversation privacy
  • Eavesdropping prevention
  • Intelligence protection
  • Executive protection



Unit wired power/charging/programming port: USB-C @ 5 V, 3.1 A
Wireless Qi charging rate: 5 W
Battery: 3.7V 5000 mAh  Li-Ion
Battery life: up to 24 h at half volume, up to 12 h at full volume
Typical charge time: 9 h
Case chargers: USB-C PD with included wall adaptor @ 20 V, 3 A (adaptor supports both 120 and 240 VAC)


Internal speaker and push terminal line out
Peak output power: 4 W
Line out amplitude: 1 V pk-pk
Audio frequency range: 100 Hz – 15 kHz
Max SPL: 98 dB at 4 ft


Unit dimensions: 4.6 × 2.6 × 0.9 in / 12 × 6.5 × 2.3 cm
Unit weight: 5.7 oz / 160 g
Case dimensions: 6 × 15 × 18.5 in / 16 × 38 × 47 cm
Case/contents weight: 16 lbs / 7.3 kg


Battery charging temperature: 0 to 23 °C (wireless), 0 to 45°C (wired)
Storage temperature: -20 to 60 °C
Operating temperature: -10 to 40 °C

Included Content

The Portable Voice Masking Kit is a deployable set of Voice Masking Generators the can be installed strategically in a target area requiring audio security. The PMK-8 includes:

  • 8 VMGs (Voice Masking Generators) with built-in speaker
  • 16 Transducers/emitters
  • 10 speaker cable sets (3ft/.9m lengths per transducer)
  • Hard shell case with built-in inductive charging
  • Mounting strips