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UHF Programmable spy transmitter with vocal activation 3V VOX33

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  • Model: VOX33S
  • Shipping Weight: 0.06lbs



A VOX is a spying and bugging listening device, which transmits audio wireless, to a compatible receiver. Unlike the usual spying equipment, it transmits only when it hears is a voice nearby. During silence it turns to standby.
This micro size spy bug spying device, monitors the room or any other place, in wireless mode.

The UHF transmitter transmits on the UHF band and the output is approximately 25mW  (in 50 Ohms antenna).
This device transmits up to 600 m in open field, line of sight (tested with ICOM IC-R20 or our special receiver PETRU433 ).

VOX characteristics

The common problems most bugs have are relative short battery lifetime and the output power.
This listening device offers an incredible long battery lifetime.
In standby mode, it draws less than 1mA. However, when a sound or a voice is heard by the sensitive microphone, it switches immediately to transmission.

This device can use a button type battery as: CR2450 or CR2430.
If using CR2450 batteries - in transmit mode (non-stop transmission) the battery lasts for approximately 24 hours, and in standby mode, approximately 960 hours (40 days)!
The super-sensitive miniature microphone, the high frequency stability (PLL quartz oscillator), and the endless frequencies that can be programmed, makes it the best device you can find.
The frequency is programmed, and cannot be modified by the user. However, upon request, we can program it to almost any frequency.
The VOX33S transmits a very powerful, clear sound.
This transmitter is designed and tested in our specialized laboratory and tested as well "in real conditions" by professional engineers for a maximal distance.


  • Voltage: 1 X CR2430 or CR2450

  • PCB Size: The size is only 2.45 cm diameter..

  • Transmitter's frequency range: NFM (UHF) 400-470MHz CRYSTAL STABILIZED Programmable in our lab.


  • Long transmitting range:  up to 400 m on clear. (L.O.S). Special powerful design.

  • Frequency is programmable (In our lab).

  • Quartz Stabilized.

  • ON / OFF switch.

  • EXTRA amplified, high power output!

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

  • The device is coated with special Anti-static material.

  • Penetrates through walls and ceilings.

  • Very easy, no time installation.

  • Motorola high amplification FET microphone, 4mm diameter immersion gold .

  • Professional gold plated board for extra stability.


  • 1 x Crystal controlled PLL PROGRAMMABLE VOX33S Voice activated VOX SPY BUG Transmitter.

  • 1 x Battery holder for CR2450 (Battery not included).

  • 1 x Instructions Manual.

UHF Crystal Controlled VOX Spy Transmitter Extended Time   UHF Spy Voice activated Transmitter Extended Time UHF Band 6V   UHF Crystal Controlled VOX Spy Audio Transmitter professional