Petrutech Spy Shop
Professional Eavesdropping, Bugging and Surveillance Equipment

UHF VOX9 voice activated bug and UHF receiver in set


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The UHF VOX9 SET, combines the miniaturization and power of the UHF VOX9 voice operated spying bug, offering an external microphone (4mm diameter), a flat layout for easy concealing, and the professional UHF-433 PLL receiver Ver. 1. The VOX9 foremost function is the voice activation, i.e it transmits just while it hears voices. For the duration of quiet time, when no one is at home or for the duration of sleeping time, it turns to standby mode, and it draws less than 1mA from the battery.
When a conversation needs to be intercepted, and you do not know when the conversation will begin, it doesn't make sense using anything else but a voice activated transmitter. The benefit of voice activation is that you do not risk spending the current from the battery, compared to a regular, ordinary room transmitter that may transmit without any nearby target. An additional advantage using our voice activated transmitters is a built-in delay before shutting off, so that if there is a pause when your targets are speaking, the system will wait before changing into a standby mode. We're adjusting every set to 100% matching frequency between the VOX spy bug and receiver's frequency. This set is using best, excessive grade components, and one of the specific receiver functions - being attentive to the conversation and recording at the same time, if it is connected to a recorder. We are adjusting each set to a 100% matching frequency. This set is using only high grade components, and one of the unique receiver features - listening to the converation and recording at the same time, if it is connected to a recorder.
The PLL UHF CRYSTAL CONTROLLED RECEIVER can be used in a room or business, indoor or outdoor. It employs a high sensitivity circuit which allows the user to pick up RF NFM Transmitters from 200m in urban areas and up to 600+ meters (Line Of Sight).


UHF Receiver

  • Working Voltage: 9V alkaline battery (not included)
  • Dimension: ONLY 2 X 5.5 X 8.7 cm !!!.
  • Receiver's frequency range: 433.8-433.9MHz
  • This is an ORIGINAL crystal controlled NFM PLL UHF receiver.
  • Double Superheterodyne - PLL
  • Sensitivity: Better than –125 dBm into 50 Ohm (12 dB/sinad).
  • Less current drawing than any similar device - due to new components.
  • It uses a special antenna, only 14cm.
  • SMD built, for more stability and range (MIL SPECS 1% accuracy)
  • Sensitivity: Better than –125 dBm into 50 Ohm (12 dB/sinad)!
  • Deviation: ~ 2.5 KHz to 6 KHz !!!
  • Outlets for audio recording and earphones.
  • The battery time-life depends on the battery freshness and brand.
  • External DC jack.
  • PROFESSIONAL PLATED BOARD FOR EXTRA STABILITY. There is NOT oxidation and dry soldered joints during the time due to the coating material.
  • The Receiver comes FULLY ASSEMBLED AND READY TO USE, Just connect it and start listening.

UHF Transmitter

  • Working Voltage: 9V ALKALINE battery.
  • Dimension: only 4 X 2.3 cm ! Very thin
  • 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!
  • Increased NB. (Narrow-band)
  • True 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 Set Crystal controlled PLL Crystal controlled receiver and UHF VOX9 transmitter.
  • 1 Instructions Manual.
  • 1 Gift


  • Model: SetVOX9S
  • Shipping Weight: 0.05Kgs

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