tubac on Adding a microphone to the 30x PTZ camera you sell.

Hi,

i bought this camera from you:http://www.securitycameraking......2US.html 

and I want to add a microphone. I power it by a 24 volt POE  injector. What do I need to make this work?

Do I need a 24 volt at compliant splitter and a 24 volt powered microphone, or can I use a 12 volt at compliant splitter and a 12 volt microphone?

The microphone will be close to the camera.

Thanks,

Tubac