aleeeeaaa

I have a Lorex NVR series N861. On the back are two rca jacks for audio in and audio out. All my cameras have built in audio. What i want to do is hook a microphone to the NVR where i can speak into it and have my voice come out of the cameras.. It says in the manual something about a self powered microphone. Not sure what i need to do. Does anyone know where i can get a microphone that will work with this NVR and how do i hook it up. The microphone will be right next ot the DVR.