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There are! https://www.omenie.com/pipistrelle.html https://www.omenie.com/pipistrelle.html

• hcfman 2y ago
  Very nice project the above. If you want to pay more you can also get Pettersen ultrasonic microphones. These have a USB microphone and will also work with my sbts-aru recorder. Which means you could in principle also geolocate where the bats are.