Hi Roberto,The microphone isn't part of a pack but is just an image used as SFX in Crazytalk. You can take any 2D image and using an image editor extract objects from them such as microphones, glasses, anything you want really. Once you have the image, you add it as SFX on the timeline in Crazytalk.
There are also a number of tutorials on using effects in Crazytalk. Click below to view the tutorials.
http://www.reallusion.com/reallusiontv/ct/tutorial.asp