Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Transmitter voice activated powerful uhf vox bug spy 3v


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This is a micro covert spy bug for surveillance featuring an astonishing long distance. This is the upgraded version of the miniature powerful voice activated (VOX)

The bug spy transmitter uses the 433MHz band and the output power is 60mW. The UHF transmitter uses the newest and highest quality microcontroller for the highest quality performance.
HIGH distance - Covering an area of 3.5km² line of sight (tested with ICOM IC-R6 from the fourth floor). Minimum 500m² in urban area, line of sight tested from the fourth floor.
This is a Professional quality PROGRAMABLE miniature UHF VOX ACTIVATED AUDIO surveillance transmitter.

VOX explanation:
The usual problems with many other bugs are short battery lifetime and usually the relative low output power.
This listening device, VOX3-1, makes it possible achieving an incredible lifetime of the battery, as when there are no sounds and voices, the transmitter switches to standby mode.
In this mode, it draws as less as 1.2mA. However when a sound or voice is reached by its sensitive microphone, it switches immediately in transmission mode.
This programmable voice activated bug listening device can use 2 types of batteries:
1. CR2450 (Button)
2. CR2477 (Button)

For example, if the device has to be concealed in a difficult, small place, the button type batteries are very effective. It is just a "throw and go" job.
When using CR2477 batteries in transmit mode the battery lasts for approximately 16-24 hours in transmitting mode (depending on brand and freshness), and in standby mode, approximately 960 hours or 40 days
It is great for room surveillance, listening to babies, nature research, etc.
The listening device uses a high-sensitive, 4mm diameter microphone and high frequency stability (PLL quartz oscillator).
Frequency is fixed by a microprocessor and can be changed by programming only by our lab staff.
It is possible to receive the signal using an any UHF NFM scanner, or UHF transceiver. The best listening devices in the market!

This micro spy transmitter is designed especially for places where the reception is difficult, as crowded urban areas or ground floor buildings. The P3-1 transmits a very powerful, clear sound. The transmitter is designed and tested in our specialized laboratory and tested as well "on field" by high skilled engineers for maximal distance.


  • Power supply: One x 3V Lithium ( CR2450 to CR2477).
  • ON - OFF Switch.
  • Dimension: The Diameter is only 2.4 cm (Less than 1.0")!
  • Frequency : NFM (UHF) 433.9-433.99MHz CRYSTAL STABILIZED. Many other frequencies available and can be programmed.
  • Estimated transmitting distance: up to 3.5km² line of sight. (L.O.S). Special powerful design.
  • Built by using just SMD components, for more stability and power (MIL SPECS 1% accuracy).
  • Frequency programmable (In our lab)
  • Using resin for encapsulating, for safety and anti - humidity!!!
  • The device is coated with special Anti-static material.
  • Penetrates through walls and ceilings.
  • Very easy installation.
  • User manual is included.
  • USA made high amplification FET microphone.
  • Professional gild PCB for extra stability.

Please note: the matching receiver for this device is the following one:

or any receiver within 400-450 MHz band and 2.5 kHz steps.


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 VOX3-1 SPY BUG Transmitter.
  • 1 Instructions Manual.
  • Model: P31
  • Shipping Weight: 0.05Kgs

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