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  • Regular price $134.37
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The V4TX is meticulously designed with compact dimensions of only 13.9mm x 19.4mm and powered by a reliable 1/3N robust lithium cell. This advanced transmitter incorporates high-quality 0402 and 0201 SMD components and utilizes the popular DL1/3N CR1/3N 3V Lithium Battery. With this configuration, the V4TX delivers approximately 22 hours of continuous and uninterrupted audio surveillance and is now available with a new extremely sensitive KNOWLES microphone, and a new high-powered crystal generating 20mW of RF power, ensuring superior frequency stability and delivering enhanced audio sensitivity.

The V4TX offers exceptional covert placement options due to its small footprint. It comes equipped with a 1 Cell 1/3N Lithium Battery retainer, enabling quick and convenient battery swaps. The transmitter features a discreet design without switches or indicator lights, ensuring covert operation.

As a permanent, always-on "hot-microphone," the V4TX initiates live transmission of ambient and surrounding audio immediately upon battery insertion, utilizing the Ultra High-Frequency band for uninterrupted signal transmission. In a cluttered urban environment, the V4TX broadcasts audio over a range of 400-500 meters, extending up to 1 kilometer with Line-of-Sight (LOS) transmission, effectively transmitting audio through obstacles such as concrete, drywall, and dense vegetation. This transmitter operates on 1x 1/3N 3V Battery, providing reliable performance.

Utilize the V4TX for discrete acoustic monitoring in areas of interest. We recommend using any handheld UHF receiver capable of tuning into the standard frequency range of 400MHz-434MHz, which is supported by most UHF receivers. For optimal performance, we suggest the Baofeng UV-5R as our recommended handheld receiver. Your transmitter will arrive with its specific Tx/Rx frequency clearly indicated on its back, ensuring seamless compatibility with your chosen receiver.

Power Supply Options

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

Dimensions 13.9mm X 19.4mm

CUI: 100 Hz ~ 20 kHz Analog Microphone Electret Condenser Omnidirectional (-42dB ±3dB @ 94dB SPL)

KNOWLES BJ-21590: 300 Hz ~ 5 kHz Analog Microphone Magnetic Omnidirectional (-75.5dB ±3dB @ 74dB SPL)

Weight 8g
Output (RF) power   20mW
Antenna Alpha Wire 8 in. Micro Coaxial Cable 38 AWG 
Frequency Range

433MHz-436 MHz, 2.5 kHz step.

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

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.

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.