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Set UHF VOX9 voice activated transmitter and UHF receiver

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  • Model: SetVOX9
  • Shipping Weight: 0.05lbs



The UHF VOX9 SET combines the miniaturization and power of the UHF VOX9, featuring an external microphone (4mm diameter on a thin cable 6 cm), a flat design and the professional UHF-433 PLL receiver Ver. 1.

The VOX9 main feature is the voice activation, i.e it transmits only when it hears voices. Whenever there is no sound, the built in automatic voice control will switch automatically the micro listening device in standby status.
This option will save the battery lifetime and at the same time, it will make the transmitter undetectable. During quiet time, when nobody is at home or during sleeping time, it turns to standby mode, and it draws less than 1mA from the 9V battery.
We are adjusting each set to a 100% precise frequency. This set is using only high grade components, and one of the unique receiver features is: listening to the conversation and recording at the same time, if it is connected to a recorder.
The PLL UHF RECEIVER can be used in a room or a business, indoor or outdoor. It uses a high sensitivity circuit which allows the user to receive VOX9 transmitters from 200m in urban areas and up to 700+ meters line of sight



  • Power supply: 9V alkaline battery (not included)

  • Dimension: ONLY 2 X 5.5 X 8.7 cm !!!.

  • Frequency: 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 SMD components. (MIL SPECS 1% accuracy)

  • External antenna, only 10cm.

  • Built by using SMD components, for more stability and sensitivity

  • Sensitivity: Better than –125 dBm into 50 Ohm (12 dB/sinad)!

  • Deviation: ~ 2.5 KHz to 6 KHz !!!

  • Sockets for audio recording and earphones.

  • External DC socket.

  • Professional plated board for extra stability. There is NOT oxidation and dry soldered joints during the time due to the coating material.

  • Just connect it to the battery, and start listening.


  • Power supply: 9V ALKALINE battery.

  • Enclosure Dimension: only 4 X 2.3 X 0.8 cm !

  • Estimated transmitting range: Up to 700m - L.O.S, on line of sight

  • Audio Compression: amplifies weak whispers, suppress high noises.

  • Using SMD, for stability and miniaturization (MIL SPECS 1% accuracy).

  • 7 phases of EXTRA amplified output

  • Increased NB. (Narrow-band)

  • Using a special material for encapsulating, for safety and anti humidity!

  • There is no interference with other devices.

  • 4 mm FET microphone on external thin cable 5cm, very sensitive.

  • The device VOX8 works up to 3 weeks connected to a 9V battery (alkaline), depending on the freshness and brand.*

  • Professional gold plated PCB for extra stability.


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


  • 1 Set Quartz stabilized receiver and UHF VOX9 bug micro hidden transmitter.

  • 1 User manual.

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