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UHF Powerful Transmitter VOX Bug 3volts voice activated

Price :
$237.00 $190.00Save: 20% off
Quantity :  
  • Model: P31S
  • Shipping Weight: 0.05lbs



Micro audio espionage voice activated bug for long-distance monitoring of a room.
This is an improved version of the tiny strong voice actuated VOX9.
For the best performance, the UHF transmitter employs the most recent and high-quality microcontroller.
HIGH POWER spying device with a 500m line of sight coverage area (tested with ICOM IC-R6 from the forth floor).

VOX features:

Short battery life and poor output power are common difficulties with many common faults.
This gadget has an extremely long battery life because when there are no noises or voices, the transmitter remains in standby mode.
It draws just 1mA in this condition, but when a sound or speech is detected by its sensitive microphone, it quickly changes into transmission mode.
This programmable voice activated insect accepts two types of batteries:

1. CR2450 (Button)
2. CR2477 (Button)

When utilizing CR2450 batteries in transmit mode, the battery lasts around 16-24 hours (depending on brand and freshness), and in standby mode, approximately 960 hours or 40 days.
It is ideal for room monitoring, espionage, and other similar tasks.
The audio bug employs a high-sensitivity 4mm microphone and a PLL quartz oscillator.
The frequency is set and can only be altered by our lab personnel.
This bugging gadget is intended for use in situations where reception is problematic, such as busy areas or ground level regions. It emits a strong, clean sound. The bugging device is created and tested in our specialist laboratory, as well as in real-world conditions for maximum 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 500m on clear. (L.O.S).

  • Using a modern microprocessor, for more stability and range (MIL SPECS 0.0001% accuracy).

  • Frequency programmable (In our lab)

  • Broadcasting through walls and ceilings.

  • High amplified FET microphone.

  • Professional gold plated board for extra stability.

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.