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  • Ultrasonic
  • Bat listening devices...
  • listening to surveillance capitalism

Ultrasonic

life and vibration above 20 kHz

Bat listening devices...

  • Wildlife Acoustics Echo Meter Touch 2 > https://www.wildlifeacoustics.com/products/echo-meter-touch-2-android
  • https://batdetecting.blogspot.com/2018/10/review-of-echo-meter-touch-2-pro-part-1_7.html

listening to surveillance capitalism

  • https://hackaday.com/2017/05/04/ultrasonic-tracking-beacons/

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