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Our flagship extended operating time Audio Surveillance Transmitter, the V2TX. Inspired by Ecologists and wildlife researchers looking for a more powerful transmitter for wildlife studies, the need to observe habitats and soundscapes of different species without disturbing their environment is paramount, remote audio surveillance of these species opens many doors not previously available. The same principle applies to monitoring different subjects of interest. Enhanced and powered by a formidable 20mW of RF, this transmitter is designed to transmit ambient audio continuously for an impressive duration of 8 days. As a permanent, always-on "hot-microphone," it initiates live transmission of ambient and surrounding audio immediately upon activation, utilizing the Ultra High-Frequency band for uninterrupted transmission. V2TX 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.

In challenging urban environments, the V2TX excels with a remarkable broadcasting range of 700 meters, extending up to 1.2 kilometers with Line-of-Sight (LOS) transmission. It effortlessly penetrates obstacles such as concrete, drywall, and dense foliage, ensuring reliable audio transmission to any UHF receiver.

Powered by two AA Alkaline batteries, the V2TX offers extended operating time while maintaining optimal performance. It allows for prolonged periods of discreet acoustic monitoring, making it ideal for remotely listening to areas of interest.

To fully utilize the V2TX's capabilities, we recommend using any handheld UHF receiver capable of tuning into the standard frequency range of 400MHz-700MHz. This range is supported by most UHF receivers. As our recommended handheld receiver, we suggest the Baofeng UV-5R, known for its reliability and performance. Rest assured, your V2TX will arrive with its specific Tx/Rx frequency clearly indicated on its back, ensuring seamless compatibility with your chosen receiver.

Power Supply 2x AA Alkaline (3v): 210 Hours Of Continuous Operation.
Dimensions 1in x 3in x .8in

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 40g
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 its longevity, the V2TX comes potted with a compound that seals all onboard components. Only the microphone and the battery terminal are accessible and made visible.