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Voice Activated transmitter 3V 70mW UHF Quartz Stabilized VOX

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  • Model: VOX 30
  • Shipping Weight: 0.06lbs



A VOX is a listening device which transmits voice wireless to a compatible receiver. Unlike simple bugs, it transmits only while there is a voice close by. During silence it stops transmitting and switches to standby.

The UHF transmitter transmits on the UHF band and the output is approximately 70mW  (in 50 Ohms antenna). It uses the most modern programmable microcontroller for excellent performance.
The highest distance may be achieved - Over 3.5 km range, line of sight (examined with ICOM IC-R6 and our special receiver PETRU433 ).

VOX characteristics:
The standard problems with many other bugs are short battery lifetime and the low output power.
This listening device extends battery lifetime, as, during silence, the transmitter remains in standby mode.
In standby, it draws less than 1 mA. However, when its sensitive microphone hears a voice, it switches to transmission mode.
The accepted batteries:

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 battery lasts for approximately 24 hours, and in standby mode, approximately 960 hours or forty days!

It is terrific for room surveillance, baby listening, nature studies, and so on.
The 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 level areas. The VOX30 transmits a  very powerful, clear sound. The transmitter is designed and tested in our specialized laboratory and tested as well "in real conditions" for maximal distance.

Our compatible receiver: 


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 3500 m on clear. (L.O.S). Special powerful design.

Programmable channel (In our lab).

Quartz Stabilized.

On / off switch.

Using a mil specs resin for encapsulating, for safety, security and anti - humidity.

The device is coated with special Anti-static material.

Penetrates through walls and ceilings.

High amplification FET microphone, 4mm diameter,gold plated.

Professional gold plated board for extra stability.



  • 1 Crystal controlled PLL PROGRAMMABLE VOX30 Voice activated SPY BUG Transmitter.

  • 1 Battery holder for 2 X AAA (Batteries not included).

  • 1 Instructions Manual.



UHF VOX bug spy transmitter, listening device, voice activated    Spia UHF VOX voice activated 3V