What microphone to get for bunker hill system?

[sweeksnc 0]

I have a bunker hill 8 channel dvr system. I am wanting to connect a small microphone to it and need to know what to search for to find one that will work. This is the first time using a camera system so unsure of what to look for to hook up.

[jeromephone 6]

look up ETS they have a full line of microphones for CCTV