Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

VOX transmitter activated by voice, external or internal battery

$228.00  $185.00
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  • Description
  • Details
  • Reviews
  • YouTube Channel


The VOX is a surveillance micro transmitter, which is activated by voice. This spying micro transmitter will transmit the sounds or voices to a remote receiver, as long as there are voices or sounds in proximity.

This transmitter uses the UHF band, and the micro-processor used can be programed to almost endless frequencies within 400MHz to 500MHz. As the transmitter is stabilized by a component named "quartz crystal", there is no frequency drift, and it will transmit always at the same frequency.

This is a very powerful bugging device, and we program its output to 70mW.

There are cases where a micro spying transmitter has to be hidden in a small space. No problem, it can use the internal battery, 3V, as CR2450 or CR2470. If there is enough space - you may use the 2X1.5V AAA batteries for prolonged transmission time.

This design is a professional spying hidden wireless microphone, and it always brings you the best results.


  • Working Voltage:3V ONE X Lithium ( CR2450 to CR2477) OR 2 X AAA batteries.
  • The battery-holder for external batteries uses an ON-OFF switch.
  • Internal, just 4mm diameter microphone.
  • Board Dimension: The Diameter is only 2.4 cm (Less than 1.0")!
  • Transmitter's frequency range: NFM (UHF) 400-499.99MHz 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 pending 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.


  • 1 Crystal controlled PLL PROGRAMMABLE VOX-35 SPY BUG Transmitter.
  • Additional battery holder for 2 X 1.5V batteries
  • 1 Instructions Manual.


UHF Voice activated transmitter   UHF VOX Bug Spy Voice Transmitter Extended Time   UHF Crystal Controlled Bug Spy Rudio activated Transmitter    UHF VOX listening device Spy Voice activatedUHF VOX Spy Transmitter activated by voice 3V


  • Model: VOX35
  • Shipping Weight: 0.05Kgs

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YouTube Channel

For your convenience and information we have added some videos to our YouTube Channel.

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

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