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--- ultrasonic [2021-07-02 18:21] – old revision restored (2019-09-13 10:49) 2601:19c:4d00:44e0:f47e:cb5b:b4ff:2b8e
+++ ultrasonic [2021-07-02 18:47] (current) – old revision restored (2019-09-20 00:59) 2a02:578:8555:e00:2d5c:277a:1816:d835
@@ Line 4: / Line 4: @@
 ==== 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/