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"Laser Listening Systems"

Listen Into Any Room From Over 10 Miles Away!

"Do Not confuse this system with the other little laser toys you see on the Internet!!!"



OFF: (281) 531-7437

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LASER EMAX-3500 Laser Room Monitoring System

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A secret surveillance is necessary. However, the operator is not able to enter the target room in order to place a transmitter.
The solution of the problem is our Laser Room Monitoring System LASER EMAX-3500.
This system allows the operator to carry out an undetectable surveillance operation from outside the building.

LASER EMAX-3500 consists of three parts:

  • Laser Transmitter
  • Laser Receiver
  • Amplifier Unit with Audio-Recorder

This system is operated by transmitting an invisible IR-beam to the window of the target room. The window pane is slightly vibrating in accordance to the sound waves emanating from speech. The beam is reflected from the window pane according to the law of optics, ie. the angle of incidence is equal to the angle of reflection. The receiver picks up the reflected beam that is modulated by the window pane vibrations, and the optical signals are automatically converted into electronic signals. The picked up speech is now filtered, amplified and recorded. Both the transmitter and the receiver are built into standard single lens reflex cameras, allowing for perfect concealment.
The complete system is supplied in a camera case incorporating amplifier, filters and recorder.

Sound wave vibrations which reflect off smooth-surface glass (single or double glass thermo pane). Transmitter laser's angle of incidence equals the angle of reflection to the receiver. Rippled or grained glass will not provide a suitable reflecting surface from which to record.

Acoustic interference cause by interior and exterior sound wave reflections may be filtered and modulated by the LASER EMAX-3500's receiving system. The transmission may be fine-tuned by means of a modulated search tone or by adjusting the placement of the receiver. Tape recordings may be further edited at the user's option.


Technical Specifications:    
Laser Transmitter LASER EMAX-3500    
Laser Type: Semi-conductor Laser
Wave Length: 750 - 840 nm
Output Power: 5 mW automatically controlled
Power Supply: 8 x 1.5 V AAA Battery (extern)
Current Consumption: approx. 100 mA
Beam Focusing: 135 mm
Target Finder: through lens
Connections: 1 for power supply
Mounting: standard to fit to the tripod
Operating Time: approx. 10 hours continuous
Other features: switchable modulation, search tone
Laser Receiver LASER EMAX-3500
Laser Type: noiseless PIN-Diode
Wave Length: Infrared
Lens: 500 mm
Power Supply: 9 V Block Battery
Battery Life: 15-50 hours (depending on the adjusted volume)
Current Consumption: 10 - 30 mA
Amplifier unit: connected by cable with Laser Receiver
Amplification: adjustable
Connections: Headphone, Speaker
Voice Filter: Equalizer, adjustable
Voice Recorder: built-in and internally connected with the amplifier
Dimensions: 470 x 380 x 220mm
Weight: 10.5 kg without batteries and tripods

LASER EMAX-2510 Opto-Acoustic Laser Microhpone


The EMAX-2510 Opto-Acoustic Laser Microphone opens up entirely new persptectives in the field of remote acoustic monitoring. The interferometric technology applied here allows to detect and make audible even the smallest vibrations, e.g. during conversations, by means of an invisible laser beam almost independently of the detection angle and the material of the target. And it really doesn't matter which target material is used. Whether paper, plastics, metal, etc., the technology can even be used through the glass panes into closed rooms or a vehicle without problems.
The voice information is transmitted as frequency modulation of the laser beam. For this complex interferometric process, the reflection properties/intensity of the reflected light is absolutely unimportant.

The EMAX-2510 Opto-Acoustic Laser Microphone is quickly assembled and ready-to-operate within a few minutes thanks to the parallax-free electronic target sight.
Operating distances of up to 150 meters with eye-safe laser class1 with the greatest possible angle independence offering good speech intelligibility and insensitivity to background noise and interference open up versatile applications. PARALLAX-FREE ELECTRONIC TARGET SIGHT.

LASER EMAX-3100 Laser Monitoring System


The EMAX-3100 Laser Monitoring System was developed for covert observations in order to extend the surveillance to rooms which can not be entered. As soon as there is a line of sight to the room to be monitored , the EMAX-3100 Laser Monitoring System can be used. Acoustic Sound waves, as for example human speech, cause minut vibrations of the window panes of a room. The absolutely invisible laser beam is sent onto the window of the room door frame or open window to be monitored and is modulated by the vibrations there. This modulated laser light is picked up by a special receiver and demodulated (speech is recovered) again. Then the audio speech is relayed back to the receiving unit, demodulated into a clear and filtered audio signal. This signal can now be listened to or also recorded.

The set-up of such an optical system can be quickly realized thanks to a pilot tone function and graphic evaluation delivered through notebook laptop computer. The high-quality tripods with gear heads and laser lining scopes provide for a solid stand of the equipment. The system consists of 2 units.


Electromax International, Inc.
11152 Westheimer, #905
Houston, Texas 77042
Phone: (281)531-7437
Fax: (281)531-1721

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