Audio Get audio volume from microphone on Android

I want to constantly listen for audio and look at the volume of the input. If it is loud enough, I want to call another function. I'm new to both Unity and C#, so I wasn't able to get much information out of the documentation.
What would an example script look like, and is there any diference between useing the microphone on Windows and Android?

 

did you get your microphone working on android? Also quite new too