There is a high pitched clicking noise coming from one of the microphone looking thing on the bottom of my mavic. It sounds kind of like a spark and happens probably 2 time per second. What is this?

That's the sonar! Means everything is working properly.

Also, there is no microphone on the aircraft.
This manual is 60 pages, but it really is something everyone needs to read am familiarize themselves with.
https://dl.djicdn.com/downloads/ ... ser+Manual+V1.2.pdf