SHIELD Portable Speech Protector

The portable speech protector will perfectly protect you from all types of eavesdropping

An improved version of EO-2 PRO speech protector, the new SHIELD will perfectly protect you from all types of wiretapping. Its big advantage is the built-in battery, which can last you up to 4 hours of operation. You can use the speech protector, for example, in the car or in a cafe and anywhere else. Its range is 3-20 meters (10-66 ft).

  • Ultrasonic noise overwhelms microphones and bugs within 3 meters (10 ft)
  • Acoustic noise protects you from eavesdropping through a wall, window or third party up to a distance of 20 meters (66 ft)
  • You can set different intensity of acoustic noise generation
  • It guarantees a perfectly safe meeting
  • You can take the speech protector with you anywhere

The ideal speech protector for all those who very often take part in meetings on the go and want to be sure that no one will eavesdrop on them during the meeting. Portable wiretapping device SHIELD lasts up to 4 hours of operation on battery. It can generate an inaudible ultrasonic noise that overwhelms microphones within 3 meters (10 ft). But if you want perfect protection, you can also use acoustic noise. The combination of these two protection layers prevents any form of eavesdropping, for example:

  • Digital and analog voice recorders
  • Voice recorders in mobile phones
  • Eavesdropping remotely through windows using laser microphones
  • Built-in and directional microphones
  • Eavesdropping via stethoscope

Ultrasound Function

It generates inaudible ultrasonic noise which blocks the microphone devices within the range of the speech protector. Protects against microphone recording. Protects especially against bugs and recording via smartphones or watches. The generated ultrasonic noise does not disrupt the course of your meeting and the jammer will remain unnoticed.

Easy to Use

The SHIELD portable eavesdropper doesn’t need to be configured or installed. You simply turn it on or off with a switch. You can set the noise generation intensity using the rotation level. You can tell if the speech protector is active by the red illuminated inscription of the SHIELD model.


Weight820 g (1.8 lbs)
RangeAcoustic voice mix: up to 30 meters (66 ft)
Ultrasound: up to 3 meters (10 ft)
Intensity of ultrasonic interference16 × 128-132 dB
Output of acoustic interference3W
Dimensions15,7 cm × 16,7 cm × 4 cm
(6 in x 6 in x 2 in)
Battery capacity4000 mAh
Battery life4-5 hours
Jack3,5 mm (0.13 in)

Acoustic Noise

Protects against eavesdropping through a wall with a stethoscope microphone and it even prevents eavesdropping remotely through window panes via a laser microphone. Acoustic noise provides an additional layer of protection against eavesdropping based on technology other than conventional microphones. For example, it protects against a third-party person listening in on your conversation from a distance. Acoustic noise can generate and mix voices in various ways. You can also record these voices yourself. When recording, you need to be 10-20 cm (4-8 in) away from the device and in a quiet environment. These then overlay the conversation itself – so they are audible to others. Thanks to this feature you can speak freely while others hear the pre-recorded voices mixed together.

Presentation and Purchase of the Products

If you are interested, please contact our sales department who will discuss your security options with you. Please send your enquiry with your contact details to: