Table of Contents
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/