Ultrasound Microphones

Dodotronic UltraMic

Avisoft Utrasound Microphone

Audiomoth Open source acoustic device

https://batsound.com/

Recording performed with Ultramic 250K, three species of bats recorded simultaneously.

Recording downsampling at 22 KHZ, to have the ultrasounds emitted by the various species of bats into the range of audible frequencies.