I learned how to detect bugging devices from this blog article. It seems all the big companies and unscrupulous people want to get your information, and listen to your conversations. We have to be aware and keep on top of this.
http://chenkinworkshop.blogspot.com/2018/02/is-there-simple-way-to-detect-if-your.html
This machine can detect electronic listening devices, or "bugs"
So who is bugging you?
http://chenkinworkshop.blogspot.com/2018/02/is-there-simple-way-to-detect-if-your.html