Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Voice Activated transmitter 3V 25mW UHF Quartz Stabilized VOX


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A VOX is a listening device which transmits voice wireless to a compatible receiver. In opposite to normal bugs, it transmits only while there is a voice close by, and for the duration of silence it stops transmitting it switches to standby.

Do you need even extra strength? A micro size spy bug listening tool, wireless room monitoring for longer distance. That is the upgraded model of the miniature, effective voice activated (VOX) P9!!!
The UHF transmitter transmits on the 433MHz UHF band and the output is approximately 25mW  (in 50 Ohms antenna). It uses the most modern and highest quality micro controller for the very best, excellent performance.
Highest distance may be achieved - Over 1 km range, line of sight (examined with ICOM IC-R6 or our special receiver PETRU433 ).
Professional first-class PROGRAMMABLE, miniature UHF VOX ACTIVATED AUDIO surveillance transmitter.

VOX characteristic:
The standard problems with many other bugs are short battery lifetime and the low output power.
This device makes it possible offering an incredible long battery lifetime, due to the fact that whilst there are no sounds and voices, the transmitter remains in standby mode.
On this stage, it draws less than 1.1 mA. however, when a sound or voice is reached by way of its sensitive microphone, it switches right away in transmission mode.
This programmable voice activated bug can use:
1. 2 x AAA Alkaline (default).
2. Upon request, custom layout, 2 x AA Alkaline batteries.
If the usage of 1250mAh batteries - in transmit mode (non-stop transmission) the battey lasts for approximately 24 hours, and in standby mode, approximately 960 hours or forty days!

It is terrific for room monitoring, baby listening, nature studies, and so on.
The excessive-sensitive microphone and high frequency stability (PLL quartz oscillator) results the best device you may find.
Over 3.5km distance or greater in open area, line of sight (examined using ICOM IC-R6 and PETRU433 receivers).
Frequency is constant and cannot be modified. However, upon request, we are able to program it to almost countless distinctive frequencies.

This bug spy transmitter is designed especially for locations in which the reception is difficult,  as crowded areas or ground floor areas. The VOX30S Transmits a  very powerful, clear sound. The transmitter is designed and tested in our specialized laboratory and tested as well "on real conditions" by excessive professional engineers for maximal distance.VOX is a listening device which transmits voice wireless to a compatible receiver. In contrary to ordinary bugs, it transmits only when there is a voice nearby, and during silence it stops transmitting.


  • Working Voltage: 2 x 1.5V (AAA) 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) 433.4-433.99MHz CRYSTAL STABILIZED.
  • Long transmitting range:  up to 1000 m on clear. (L.O.S). Special powerful design.
  • SMD built, for more stability and range (MIL SPECS 1% accuracy).
  • Frequency is programmable (In our lab).
  • Quartz Stabilized.
  • On / off switch.
  • EXTRA amplified, buffered high power output!
  • True NFM - The only one Varicap controlled 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.
  • Very easy, no time installation.
  • User manual is included.
  • USA made by Motorola high amplification FET microphone, 4mm diameter emersion gold .

Please note: We can supply several frequencies on demand, however it may take up to 4 business days for supplying special frequencies on UHF 433 or 418 MHz band. If required, please contact us.


  • 1 Crystal controlled PLL PROGRAMMABLE VOX30S Voice activated SPY BUG Transmitter.
  • 1 Battery holder for 2 X AAA (Batteries not included).
  • 1 Instructions Manual.
  • Model: VOX 30S
  • Shipping Weight: 0.06Kgs

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