Prices include VAT & UK mainland delivery, unless otherwise stated. To order from outside the UK mainland, please email us!
All orders come with our exclusive 60 day 100% satisfaction guarantee!


Ultrasonic microphones for your phone or tablet
Works with Windows, OS X, Android, iOS & Linux (USB-C)
Call me on 0333 9000 927 for a chat
The u256 & u384 have my 60 day 100% Satisfaction Guarantee & extra year's warranty
For anything on a wildlife theme: Ask Martin!

Hi there,
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What can I say about the Pettersson U384 & U256?
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If you're looking for an ultrasonic microphone to plug into your device, the Pettersson u384/u256, Pettersson M500, Pettersson M500-384 and Echo Meter Touch 2 are the ones to consider.
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The main consideration is going to be which device you want to plug it into. The u384 & u256 now have a USB-C connector, the M500 & M500-384 use a USB-A connector, the Echo Meter Touch 2 for Android & iOS uses a USB-C connector.
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I want you to be 100% happy, so please call me on 0333 9000 927 for advice.
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Warm Regards,
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Martin.
Free extra year's warranty with all bat detectors!
Warranty: 1 year (2 years from me)
The u256 & u384 set a new standard for USB microphones offering excellent sensitivity, low noise, small size and ultra-low power consumption – all for a modest price. The components are housed in a slim and durable aluminium enclosure.
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Like the well-known Pettersson M500-384 microphone, the u-series microphones identify as standard audio recording devices on Windows, OS X, Android, iOS and Linux. Likewise, they are compatible with most common sound recording apps and programs. The microphones are of course compatible with BatSound and BatSound Touch software (for Windows). Some other recommended software for various operating systems include Audacity (Windows, macOS, Linux), Ultrasonic Analyzer (iOS) and Bat Recorder (Android). For information about the specifications and availability of these, please refer to the respective software developer.
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The Bat Recorder app for Android devices is available in a paid and free version for the Pettersson u256 and u384 (works also with the M500-384).
Download the installation file here (select “Special Pettersson Version”): www.digitalbiology.com/BatRecorder-Downloads/
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More information about the Bat Recorder app can be found here: www.digitalbiology.com/BatRecorder
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Please verify the hardware/software compatibility and that 256/384 kHz recording is supported. Certain smartphones/tablets – particularly low-end devices – have been found not to support USB audio at 256/384 kHz.
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The USB connector on the u256/u384 plugs directly into a type C jack, becoming a small and portable recording unit. In order to connect the u256/u384 to devices with other types of USB jacks or when space constraints make it difficult to plug the u256/u384 directly into the USB jack, an optional extension cable and/or adapter can be used (not included).
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Please note that the smartphone in the picture is only shown as reference and is not included with the u256/u384. Select the model you require during checkout!
u256
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Weight: 25g
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Dimensions: 43 x 35 x 13 mm
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Current consumption: 26 mA
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​Frequency range: 1kHz - 128 kHz
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​Recording format: 256 kHz / 16 bits
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​Anti-aliasing filter: Yes
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​Warranty: 1 year (2 years from me)
u384
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Weight: 25g
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Dimensions: 43 x 35 x 13 mm
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Current consumption: 28 mA
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​Frequency range: 1kHz - 192 kHz
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​Recording format: 384 kHz / 16 bits
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​Anti-aliasing filter: Yes
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​Warranty: 1 year (2 years from me)
Comment from a client:
"My bat detector microphone failed during a dawn survey and knew that I had a group of dusk surveys starting in two days time. I was not in a good place as I did not have a spare, but my equipment was less than a year old.
After my survey I contacted Martin by email and he called me back on the same day, a few hours later, after a quick nap. He told me he did not have a part in stock, but had already contacted the supplier on my behalf.
The next day I received a replacement part, free of charge and express delivered from Switzerland. I thought it was amazing, and could not believe it was resolved so quickly.
Due to Martin's exceptional service I was good to go with the surveys, and I really would like to thank Martin and Wildlife Countryside Services for making the dusk surveys happen."
David Kent

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