Hi, 
  
I have bought a SANNCE 8 Channel CCTV HDMI H.264 DVR 4 Outdoor 800tvl Night Vision Camera Home Surveillance Security Video System, QR Code Scan, Internet & Realtime Recorder (No HDD Pre-installed) CCTV setup -  http://tinyurl.com/lqv8h7c 
  
On the audio description it mentions that the system has - Audio Input/Output: RCA 4/RCA 1 - However, I am having some difficulties setting this up. I have purchased a 20m  
  
However, my main problem is the audio feed. I have purchased a Komodo 20m RCA AV CCTV Extension Cable / Extends Audio Video and Power / For Security Camera and a cheap an cheerful mic with a power feed and a white connector http://tinyurl.com/mp933az 
  
Can anyone advise where I am going wrong with this or if I even have the right equipment? 
  
Thanks in advance