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Powerful UHF VOX BUG SPY VOICE ACTIVATED 3 to 9V Long Microphone

Price :
$382.30 $234.80Save: 39% off
Quantity :  
  • Model: P91-3A
  • Shipping Weight: 0.05lbs



A VOX (Voice Operated Xmitter) spying device is a micro transmitter that can be hidden in various places.
VOX transmitters are activated by voice. This specific one uses an external microphone, and concealing it is very easy.

The VOX transmitter will continue transmitting for a short period of time, programmed by us. If during the transmitting preset time it will pick up any sound or voice, it will continue transmitting loud and clear, to a frequency matching receiver, (not included)  which is also programmed in our labs.
When there are no voices or sounds around the microphone, it will quit transmitting, and switches to "standby mode", waiting for a sound / voice.
As soon as the microphone will pick up a sound - it will switch to active transmissions.

This way, three goals are achieved:
1. Huge battery preservation on this transmitter.
2. Huge battery preservation on the receiver.
3. During standby mode, the VOX spy transmitter cannot be detected.

This is the ideal, high power spy micro transmitter, which will bring you the best results!
The output power on the 433MHz band is 60mW. We can provide endless frequencies within the 400MHz to 470 MHz. The UHF VOX transmitter uses the newest and highest quality micro-controller for the highest quality performance.
HIGH RANGE - Covers an area of up to 4000 m line of sight (tested with ICOM IC-R6 from the forth floor). Minimum 500m in urban area (Line Of Sight) from 4th floor.
Professional quality PROGRAMMABLE miniature UHF VOX ACTIVATED AUDIO surveillance transmitter.

VOX characteristics:
The usual problems with many other bugs are short Battery lifetime 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 1.3mA, however when a sound or voice is reached to its sensitive microphone, it switches immediately in transmission mode.
This programmable voice activated bug can use 4 types of batteries:

1. CR2450 (Button)
2. CR2477 (Button)
3. 2 x AAA or AA batteries (Alkaline)
4. a 9V Alkaline / Li-ion   

If the device has to be concealed in a difficult, small place, the button type batteries are very effective.
If the place is noisy for longer time, using 2 x AA or 2 X AAA batteries is preferable.

If using 1250mAh batteries - in continuous transmitting mode, the battery lasts for approximately 19-24 hours, and in standby mode, approximately 960 hours or 40 days
It is great for room surveillance, baby monitoring, nature research, etc.
High-sensitive microphone and high frequency stability (PLL quartz oscillator).
Frequency is fixed by the microprocessor and quartz crystal and can not be changed.
It is possible to receive the signal using most UHF NFM scanners, or transceivers. This is 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 listening device 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
A very sensitive receiver as our Petru433 is strongly recommended (not included in price).


  • Working Voltage: 2 x3V (AA or AAA) or ONE X Lithium ( CR2450 to CR2477) or ONE x 9V.

  • External 4mm diameter on 5.5 cm thin cable microphone.

  • 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.


  • Long transmitting range:  up to 4000 m² on clear. (L.O.S). Special powerful design.

  • SMD built, for more stability and range (MIL SPECS 1% accuracy).

  • Frequency programmable (In our lab)

  • 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.

  • Very easy, no time installation.

  • User manual is included.

  • High amplification FET microphone.

  • Professional gold plated board for extra stability.


  • 1 Crystal controlled PLL PROGRAMMABLE P91-3 SPY BUG Transmitter.

  • 1 Connector for 9V battery.

  • 1 Battery holder for 2 X AA or 2 X AAA batteries.

  • 1 Instructions Manual.



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