Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

Voice activated bug spy powerful transmitter vox9


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VOX9 bug spying microphone transmitter is different from the other transmitters that we have, because it has the VOX function: it allows the battery saving because it only transmits when there is a sound activity in that area.

The voice activated bug transmitter uses an external micro size microphone, only 4mm diameter at the end of a 5.5 cm cable, and it has a very flat level design. During quiet intervals, when nobody is at home or during sleeping time, it turns to standby mode, and it draws less than 1mA from the battery.

One of the most important features is that the sensitivity of this transmitter is adjustable by the customer. In noisy areas, the customer can adjust very easy the voice activation level, so street noises or air flow by air-conditioner will not influence the activation level.

This important feature, having control on the voice level on VOX spy transmitters or listening devices can be found only on our VOX9 and VOX8.  

This device uses a 9V battery.

This voice activated "bug" spying device is using only high grade components.

The VOX9 RF Narrow band FM Transmitter has an estimated range from 200m in urban areas and up to 700+ meters on clear areas (Line Of Sight).


  • Working Voltage: 9V ALKALINE battery.
  • Dimension: only 4 X 2.5 cm !
  • External microphone, 4mm diameter on 5.5 cm cable.
  • Long transmitting range: (Up to 700m - LOS on clear)
  • Audio Compression: Amplifies weak whispers, suppress high noises !!!
  • 30% less current than VOX7 - due to new components.
  • Using SMD, for stability and range (MIL SPECS 1% accuracy).
  • 7 stages EXTRA amplified output!
  • Added one more audio stage - 30% more sensitive than VOX6 - Increased NB. (Narrow-band)
  • NFM - Varicap controlled for power and stability.
  • Using a patent pending material for encapsulating, for safety and security !!!
  • Ground Plane design, less interferes with other devices.
  • The ONLY ONE that has a frequency range of: 418MHz or 433MHz Crystal Controlled for high stability and PRIVACY.
  • Its tiny electret microphone is so sensitive that you will hear a whisper from up to 100 sq. meters (120 sq. yard) around , crystal clear. You won't miss a whisper. USA made by Motorola high amplification microphone.
  • The device will work up to 3 weeks connected to a 9V battery (alkaline), depending on the freshness and brand.*

*The calculation on VOX mode for up to 20 days is with a 9V alkaline battery and assuming 2 hours of conversations per day (the total of all the activity of the day).


  • 1 Crystal controlled  UHF VOX9 transmitter.
  • 1 Instructions Manual.
  • Model: VOX9S
  • Shipping Weight: 0.05Kgs

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YouTube Channel

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