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British Wildlife

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British Wildlife is the leading natural history magazine in the UK, providing essential reading for both enthusiast and professional naturalists and wildlife conservationists. Published eight times a year, British Wildlife bridges the gap between popular writing and scientific literature through a combination of long-form articles, regular columns and reports, book reviews and letters.

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Conservation Land Management (CLM) is a quarterly magazine that is widely regarded as essential reading for all who are involved in land management for nature conservation, across the British Isles. CLM includes long-form articles, events listings, publication reviews, new product information and updates, reports of conferences and letters.

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Wildlife Survey & Monitoring  Bat Survey & Monitoring  Ultrasound Microphones

Ultramic384K BLE

  • High performance omnidirectional audio and ultrasonic microphone
  • Smart autonomous recorder
  • Driverless USB 2.0 full speed connection
Ultramic384K BLE
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About this product Specification Customer reviews Related products

About this product

The Ultramic384K BLE is a high-quality device that can operate as both an ultrasonic USB microphone or an unattended audio and ultrasonic recorder. It has an integrated analogue to digital converter able to achieve a 384Khz sampling rate - this means that you can record sounds up to approximately 190kHz. The full speed USB 2.0 port allows easy connection to your PC, iOS, Android smartphone or tablet and to embedded Linux systems. When used with an external USB battery, the low power, integrated 32-bit microcontroller makes it the perfect device for long term autonomous recording. Only 30mA at 5 Volts of power is required when operating at full speed. Connection to host devices is driverless which adds to ease of use. Hardware amplification gain is set via two switches. It is easy to disassemble the device in order to gain access to the SD card slot, back-up battery, pre-amplification switches and push button. There is also Bluetooth connection (used only for easy configuration of the microphone if used as an autonomous recorder). The aluminium tube is connected to the circuit ground plane and it reduces the sensor vibration and minimizes electrical interference. The FG microphone is very sensitive, with a good signal/ noise ratio and a flat frequency response.

Applications for this device include the detecting and recording of biological ultrasounds for bioacoustics studies on bats, insects, rodents and cetaceans (when connected to a hydrophone). It is also highly useful for impact studies involving wind farms and bats.

User guide for Ultramic384K available here.


Length: 160mm
Diameter:  25.4mm
Weight: 129g (coin battery included)
Recording format: Linear PCM (Pulse Code Modulation) format
Recording medium: SD card (512MB to 2GB), SDHC card: (4GB to 32GB), SDXC card (64GB to 512GB)
Input:  IN+ IN- 0 – 1 V differential voltage input
USB B connector:  USB 2.0 Full Speed, USB audio class 1.1
Reference input level: Switch setting - Level Value  HI  - 114dBSPL, LOW - 74dBSPL
Sampling frequency: 384Khz sampling per second
Resolution: 16 bit
Amplification: High quality, low noise, differential analogue amplification with no filter
CPU: 32 bit integrated ARM Cortex M4 microcontroller
Power: 35mA power requirement in USB mode, 30mA mean power requirement in autonomous recording mode, 140mA maximum peak while recording
Update: Software upgradable via firmware file stored in the micro SD card
Microphone sensor: FG23629 from Knowles
Backup battery: CR1220 coin cell backup battery

Customer Reviews

  • High performance omnidirectional audio and ultrasonic microphone
  • Smart autonomous recorder
  • Driverless USB 2.0 full speed connection
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