Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Set UHF voice activated VOX V3 and PTR433 receiver

$455.00  $409.50
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Powerful voice activated micro transmitter VOX30 and programmable receiver PTR433

Powerful set of spy bug programmable transmitter, voice activated VOX, and programmable sensitive receiver PTR433.

A VOX is a surveillance device which transmits the audio, wireless, to a remote receiver. During conversations or speaking time it will transmit a clear sound, as a commercial radio station. The VOX is programmable and we program it in our lab. We can program it to almost endless frequencies in the UHF band. Shortly, after a defined time, if it won't "hear" voices or sounds, it ill switch automatically to standby mode, and it will quit transmitting. If it will hear any sound again, it will switch to transmitting mode.

This way, it preservers the battery life for a very long time. 

The microphone is very sensitive. and will pick up a voice sound from approximately 5m (~ 16ft.). 

The receiver is designed by us. It is inserted in a transceiver and replaces the original transceiver's receiver. This receiver competes the best expensive receivers in the market, programmable and sensitive. It uses a short antenna, and it is rechargeable.


The transmitter

  • Working Voltage:3V ONE X Lithium ( CR2450 to CR2477)
  • Internal 4mm diameter microphone.
  • Board Dimension: The Diameter is only 2.4 cm (Less than 1.0")!
  • Transmitter's frequency range: NFM (UHF) 400 to 460 MHz CRYSTAL STABILIZED.
  • Long transmitting range:  up to 3000 m² on line of sight. (L.O.S). Special powerful design.
  • Using a microprocessor SMD, for more stability and range (MIL SPECS 0.0001% accuracy).
  • Frequency programmable (In our lab)
  • NFM - for power and stability.
  • Using a patent material for encapsulating, for safety, security and anti - moisture!!!
  • The device is coated with special Anti-static material.
  • The transmissions penetrate through walls and ceilings.
  • USA made, high amplification FET microphone.
  • Professional gold plated board, for extra stability.


The receiver

  • Working Voltage: 3.7V Li-ion, 1500mAh. rechargeable.
  • Estimated working time between charging: 10-12 hour.
  • Smart charger: Desktop charger
  • Dimensions: 110 X 50 X 32 mm (without antenna)
  • Stability: 2.0ppm.
  • Frequency: True NFM (Narrow Band FM)(factory programmed).
  • Distance: Extreme Long receiving distance. Picks up transmissions through walls and ceilings.
  • Receiver's frequency range: Frequency range 400 - 450 MHz (PROGRAMMABLE).
  • Sensitivity: Better 0.55 µV into 50 Ohm (12 dB/sinad).
  • Deviation: 2.5 KHz to 6 KHz
  • Outlets for external audio recording or earphones.
  • Adjacent Channel Selectivity: ≥60dB
  • Gold plated PCB.
  • 15 programable channels (in our lab)!
  • Audio:High quality 1000mW
  • Antenna: semi-flexible DETACHABLE antenna, 10 cm.
  • Adjustments: No adjustments are required.


  • 1× Portable radio
  • 1 x VOX3.0
  • 1× Inductively loaded antenna
  • 1× Li-ion battery pack
  • 1× Desktop charger
  • 1× Belt clip
  • 1× Hand strap



  • Model: PTRVX30
  • Shipping Weight: 0.12Kgs

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YouTube Channel

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The videos are designed to give you a better insight of the functionality of our equipment.

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