Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Encased vox spy transmitter UHF microphone activated by voice


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Miniature powerful hidden audio transmitter VOX with vocal activation 

We are often asking for a powerful audio transmitter, which may transmit the audio wireless, to a long distance remote receiver. However, at the same time, we wish to keep the battery life as long as possible. We also ask for extended privacy, so our transmissions won't be received by someone in the neighborhood.

This is a very powerful voice activated device, named VOX, a device that it is activated by voice. Usually, it is in standby mode, it is not transmitting, and draws just 1mA from the battery - almost nothing. However, as soon as an audio sound is captured by its sensitive microphone, it is automatically activated and begins transmitting. Therefore, it is saving the battery life for a long time. It also transmits the audio, using the UHF band, for total privacy.

This bug spy hidden transmitter it is in use by the best detectives, and also by many authorities, worldwide.


  • Working Voltage: 2 x 1.5V AAA or AA batteries
  • Board Dimension: The size is only 3 cm X 3 cm BOXED so it may work even on severe weather.
  • Transmitter's frequency range: NFM (UHF) 400-460MHz CRYSTAL STABILIZED.
  • Long transmitting range:  up to 4000 m line of sight. (L.O.S). Special powerful design.
  • The Frequency is programmable (In our lab).
  • Quartz Stabilized, 0.000001% drift.
  • On / off switch.
  • High power output! Average: 70mW
  • NFM for power and stability.
  • Using a patent pending material for encapsulating, for safety, security and anti - moisture!!!
  • The device is coated with special Anti-static material.
  • Penetrates through walls and ceilings.
  • User manual is included.
  • USA made by Motorola high amplification FET microphone, 4mm diameter emersion gold .


  • 1 Crystal controlled PLL PROGRAMMABLE VOX40 Voice activated SPY BUG Transmitter.
  • 1 Battery holder for 2 X AAA or AA batteries (Batteries not included).
  • 1 Instructions Manual.



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  • Model: VOX40

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