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  • Regular price $230.00
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Measuring only 13.9mm X 19.4mm and utilizing a 1/3N robust lithium cell.

This is one of our newest Acoustic Surveillance Transmitters. The V4TX is populated by 0402 and 0201 SMD components and uses the popular DL1/3N CR1/3N 3V Lithium Battery. You can expect approximately 22 hours of continuous & uninterrupted audio surveillance from this mighty small transmitter pushing almost 18mw of RF. Each transmitter is soldered under a microscope and quality tested prior to packaging. 

  • An excellent option for covert placement due to its small footprint.
  • Transmitter comes mounted with 1 Cell 1/3N Lithium Battery retainer for quick battery swaps.
  • No switches or indicator lights.

This is a permanent, always-on "hot-microphone", once the battery is inserted the V4TX will begin live transmission of ambient and surrounding audio without interruption on the Ultra High-Frequency band. The V4TX will broadcast audio over a distance of 400-500 metres in a cluttered urban environment, up to 1 kilometre with LOS, broadcasting audio through concrete, drywall, and thick bush to any UHF receiver, this transmitter operates on 1x 1/3N 3V Battery.

Use this transmitter to remotely listen to an area of interest that requires discrete acoustic monitoring. We recommend any handheld UHF receiver capable of tuning into the 400MHz-434MHz range, this is a standard range in most UHF receivers. Our recommended handheld receiver is the Baofeng UV-5R. Your transmitter will arrive with its specific Tx/Rx frequency noted on its back.

Power Supply Options

1x 1/3N (3V) ~22 Hours Of Continuous Operation.

Dimensions 13.9mm X 19.4mm

100Hz ~ 20kHz Panasonic: Analog Microphone Electret Condenser. Directional Characteristic: Omni-Directional
Sensitivity: -7.0 ±4 (0 dB = fs/Pa@1kHz).
Signal to Noise Ratio: 78 dB Typ. at 1kHz.
Max Input Sound Level: 101 dB SPL Typ.

Weight 8g
Output (RF) power   18mW
Antenna Whip, shielded, .5-.8mm NiTinol.
Frequency Range

136-174MHz/434MHz-436 MHz, 2.5 kHz step.

Effective Range 15m From Centre. 
Stability  Highly Stable. Crystal Referenced Phase-Locked Loop.
Crystal 00k/ASK Data Transmitter.

TINYTX's transmitters are easily paired with any compact hand-held transceiver. Any Two-Way UHF Radio will work, but we recommend the BaoFeng UV-5R from FengBros. Fengbros has been our trusted supplier for the last year, they offer certified Baofeng radios at the most competitive price.

In order to maintain their longevity, transmitters are potted with a compound that seals all onboard components, only the microphone and the battery terminal are accessible and made visible.

HAVE A NON-TRADITIONAL AUDIO SURVEILLANCE APPLICATION? We can design for your needs. TINYTX has designed and manufactured hidden and covertly disguised audio surveillance transmitters for several client projects and applications.
Contact us for turnkey solutions.