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NHBS In the Field – Pettersson U-series USB Ultrasonic Microphone

Antonia Peacock
Antonia Peacock

The Pettersson U-series microphone is a powerful ultrasonic USB microphone that is designed to be plugged into a smartphone, tablet or laptop to listen to and record bats. The microphone is available in two options: the u256, which has a sample rate of up to 256kHz and the u384, which has a sample rate of up to 384kHz. Both models use a MEMS ultrasonic microphone for its high sensitivity, low noise and ultra-low power consumption. The units themselves are pocket sized and feature a robust aluminium outer casing, making them ideal for taking out into the field. They connect to your device using a micro-USB connector but can be converted to connect to USB-C, lightning connector, or USB by using an adapter. Once connected, they can then be used alongside a variety of apps for viewing and recording bat calls. 

How We Tested

We tested the Pettersson u384 with a fully charged Samsung Galaxy Tab S3 using the Bat Recorder app from the Play Store. The app instantly recognised the microphone when plugged in using an Arktec Micro USB to USB-C adapter. We took the device out on a warm early September evening around the time of sunset and chose a footpath which included some open areas and some wooded areas to allow the microphone to detect bats as we walked through differing habitats.

What We Found

The Pettersson u384 produced beautifully clear recordings with little noise. The Bat Recorder app worked perfectly with the Pettersson u384 , producing wonderful live sonograms and making it easy to record calls and look back over previous recordings. We recorded noctule, soprano and common pipistrelles on our short bat walk, and it was clear that the microphone was picking them up from at least 15m away when the bat was flying towards us. When listening out loud, we had to ensure the listening mode was on ‘Heterodyne’ rather than ‘Frequency Division’, so as to avoid audio feedback when the volume was high, but listening through headphones was easier and meant there was no risk of feedback. 

Our Opinion

The Pettersson u384 is an excellent quality microphone that produces low-noise, professional recordings. It has the advantage of being small and incredibly easy to transport – working alongside a device that most people already carry with them on surveys and bat walks. The Bat Recorder app was easy to navigate and very well made, although it would have been nice if the £5.49 cost of the app was already incorporated into the cost of the detector, or if the detector came with its own app for convenience, but Pettersson do state that the recorder works with multiple recording apps. We would recommend that live audio is listened to through headphones to avoid interference and help preserve the clean and crisp recordings that the detector was capable of. Overall, the Pettersson u384 is a fantastic USB microphone that would be a great asset to any bat worker or ecologist.


The Pettersson U-Series USB Ultrasonic Microphone is available through the NHBS website.

To view our full range of bat detectors, visit www.nhbs.com. If you have any questions about any of our products or would like some advice then please contact us via email at customer.services@nhbs.com or phone on 01803 865913.