The Stealth SM2040DX

Portable Audio Jammer and Speech Protection System

The Stealth SM2040DX is the most advanced portable audio jammer and speech protection system which protects you against third person listening, eavesdropping, and recording devices. The Stealth SM2040DX creates sound barrier interference which masks your speech and conversation to be extremely difficult or impossible to extract the original content from the noise.


When it is used in the correct manner, The Stealth SM2040DX will protect you from;

  • Third person listening
  • Voice recorders(tape and digital)
  • Microphones, wireless microphones
  • Stethoscopes, laser listening device
  • GSM/Bluetooth/Wi-Fi transmitters, etc.


Main Functions


  1. Sound Masking (Audio Jamming)

The 2 channel chaotic noise (Distortion + Reverberation) in a random sequence secures your privacy and information from recent hi-tech speech extraction software.

  • Main Speakers: 500 mW x 2(Top & Bottom) – adjustable output level

The built-in 2 speakers create sound barrier interference against listening and recording nearby its location. Indoor interference

  • Sub-Transducer: 500 mW x 2 – adjustable output level

These 2 special transducers (TRN600S) can be installed on window, wall, partition, ceiling and hard floor toemit the chaotic noise with random vibration depending on the output of noise to protect your speech and conversation from eavesdropping and third party listening. Outdoor interference

  • External Output

The Stealth SM2040DX provides a 3.5 mm standard external output jack for an external speaker (Omni-Speaker) or amplifier for extra sound barrier, if necessary.


  1. 4 Channel Communication Ports

The Stealth SM2040DX has 4 built-in channel communication ports to provide high quality secured communication for protecting speech between up to 4 people.

  • Each communication port can be controlled its output level to optimize for each user
  • The users between its communication ports won’t be disturbed by the interference of chaotic noise.



  • Protects against all known methods of listening and recording devices - All types of radio microphones, stethoscopes, voice recorders, passive resonators and wired microphones, etc.
  • Voice Activated output for efficient and comfortable usage – The output audio interference level is being generated simultaneously with the input human’s speech. The volume of this interference is higher than a person’s voice; therefore neither a listening device nor a recorder is able to pick it up.
  • Compact Portable Design – it can be easily carried and prepared for instant usage.
  • Easy to use – No professional installation and skills are required
  • Provides a much higher level of protection than any white-noise generator in the market.
  • It can be used in any situation. – Office, Home, Meeting Room, Car, Hotel
  • The transducers and external output give additional protections against any recording and eavesdropping activities – Triple protection
  • Each noise output and communication channel can be adjusted individually for best result.
  • Absolutely harmless – no microwave reflections or ultrahigh sound noise.



  • Type of Noise:                                2 Channel Chaotic Noise (Distortion + Reverberation)
  • Output (Electronic volume control)   Voice Activated Output

2 Built-in Speakers (Top & Bottom) – Max. 500 mW

TRN 600S Transducers – Max. 500 mW X 2 with Random Vibration

EXT Output – 500 mW

  • Communication Ports:                     4 Ch of adjustable outputs for headphone
  • Headphone                                     Noise Cancelling Stereo with Microphone (Included 2 headphones)
  • Power Source                                 110 V AC Adaptor (USA) or 220 V AC Adaptor

(Car Cigar Jack: 9 V ~ 28 V DC – Option)

  • Dimensions (without handle)            160 W x 160 L x 35 H (mm) (6.25 W x 6.25 L x 3.44 H (inch)
  • Weight                                            1.2 Kg (2.5 Lbs)


Package Contents

  • The Stealth SM2040DX x 1
  • Headphone with Microphone x 2 – Additional Headphone can be purchased
  • Transducer: TRN 600S (Sound + Vibration) with cable x 2
  • 110 V AC-DC Power Adaptor x 1 (USA) or 220 V AC-DC Adaptor x 1
  • User Manual





The Stealth SM2040DX

White Noise Generator

Portable Noise Generator

Noise Type

2 Channel Chaotic Noise (Distortion + Reverberation)

Random white noise

Random white noise


2 of Built-in speakers, 2 of transducers and external speaker

Transducers and external speakers (Omni-speaker)

1 of built-in speaker

Output Type

Voice activated simultaneous 2 channel random sequenced chaotic noise with the input human’s speech

Continuous random White Noise with random sequence

Continuous random White Noise with random sequence


Easy to carry and use

Protect users from indoor and outdoor eavesdropping

Permanent installation required by professional technician.

Protect users from outdoor eavesdropping only.

Easy to carry and use

Protect users from eavesdropping in a limited area only.

Emitting Noise

Emitting noise around its location and through wall, window and ceiling to outside of room

Emitting its noise through wall, window and ceiling to outside of room (No protection for indoor)

Emitting noise around its location for limited effective radius

Communication Port

4 Communication ports





The users can use the headphone or reduce the output level of built-in speakers for clear conversation.

None (or a bit) of interference noise inside of room

The user must bear its interference noise during usage for secured conversation.

Adjustment output

Each channel can be adjusted easily by user

Each channel may be adjusted by a technician

The main volume may be adjusted easily by user



High for devices and labor



Portable and easy to use

Permanent installation

Portable and easy to use

Power Source

AC Power,

Car Cigar Jack: 9V~28V DC (Option)

(Can be modified with a bulk order)

AC Power