Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Powerful UHF vox bug spy transmitter 3v voice activated


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A micro spy bug for room monitoring for long distance. This is the upgraded version of the miniature powerful voice activated (VOX) 9!!!
433MHz 60mW UHF transmitter uses the newest and highest quality microcontroller for the highest quality performance.
HIGH RANGE - Covers an area of 3.5km² lineof sight (tested with ICOM IC-R6 from the forth floor). Minimum 500m² in urban area (Line Of Sight) from forth floor.
Professional quality PROGRAMABLE miniature UHF VOX ACTIVATED AUDIO surveillance transmitter.

VOX feature:
The usual problems with many other bugs are short Battery Life and the low output power.
This device makes it possible for an incredible lifetime of the battery, as when there are no sounds and voices, the transmitter goes in standby mode.
In this state, it draws only 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 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 battey 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 monitoring, baby listening, nature research, etc.
High-sensitive, 4mm microphone and high frequency stability (PLL quartz oscillator).
Frequency is fixed and can be changed 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 bugging spy transmitter is designed especially for places where the reception is difficult,  as crowded areas or ground floor areas. The P3-1 broadcasts 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.


  • Working Voltage: One x 3V Lithium ( CR2450 to CR2477).
  • ON-OFF Switch.
  • Board Dimension: The Diameter is only 2.4 cm (Less than 1.0")!
  • Transmitter's frequency range: NFM (UHF) 433.9-433.99MHz CRYSTAL STABILIZED. Many other frequencies available and can be programmed.
  • Long transmitting range:  up to 2.5km² on clear. (L.O.S). Special powerful design.
  • SMD built, for more stability and range (MIL SPECS 1% accuracy).
  • Frequency programmable (In our lab)
  • EXTRA amplified, buffered output!
  • 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.

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 P3-1 SPY BUG Transmitter.
  • 1 Instructions Manual.
  • Model: P31S
  • Shipping Weight: 0.05Kgs

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