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  • Regular price $350.00
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The enhanced V2 model of our USBTX, now with a much more stable crystal and a complete overhaul to the original circuit and design, V2 addresses the previous models' frequency shift and unstable performance once and for all, offering a crystal clear and stable audio transmission without static or frequency shift. USBTX is operating via USB, this surveillance transmitter will allow for infinite operating time if plugged directly into a mains USB port, or extended operating times reaching several weeks or months of uninterrupted audio transmission when used with a portable USB battery pack. This is a permanent, always-on "hot-microphone", once the USBTX is inserted into a USB port it will begin live transmission of ambient and surrounding audio without interruption on the Ultra High-Frequency band.

The USBTX will broadcast audio over a distance of 700 meters in a cluttered urban environment, up to 1.2+ kilometres with LOS, through concrete, drywall, and thick bush to any UHF receiver, significantly more range is achievable when USBTX is plugged into mains USB power (like a standard charginf cube) or a portable battery charger that offers 2Ah+ of output.

Use this transmitter to remotely listen to an area of interest that requires discreet 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 USB Male = infinite transmission time when plugged into a constant USB power supply, several weeks or months when plugged into a portable USB battery pack.
Dimensions 60mm x 10mm x 2mm

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 11g
Output (RF) power  30mW
Antenna Alpha Wire 8 in. Micro Coaxial Cable 38 AWG 
Frequency Range

430MHz-439 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 its longevity, the USBTX comes potted with a compound that seals all onboard components. Only the microphone and the USB terminal are accessible and made visible. Looking for something smaller and just as capable? The V3TX is truly tiny, measuring only 13.9mm x 19.4mm x .8mm.