I have the PTZ x40A
could you not hook up the mic to the audio IN and get power from the cam ?
I tried .... without the mics power plug and it didn't work. Had to use the mics power plug.
The mic i used was a small micro mic from Amazon. I was able to hear what's said outside on my computer speakers.
If i was to hook up cable to the audio out on the camera and the other end to audio in on my TV, i would hear the sound thru the TV, record video on a microSD card and didn't have to buy a DVR.
I have a small netbook (because screen is broken) that i use, hook up to a 23" TV that i use as my cameras monitor. I have a laptop for my other internet needs. I keep a window on the laptop open with the camera software running so i can at least PTZ without having to go to the netbook or i'll use my phone or tablet.
FYI:
If you click on the pic below, you can actually read the sign on the tow truck. The camera is not zoom in.