Hi folks, I recently came across 2 dvr units in my closet that I had picked up over the summer and need to deal with them. 
  
I know very little about these units or even if they are worth messing with. Any help provided would be greatly appreciated. 
  
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dvr 16ch 
no power supply (uses a 4-pin dc 12v) 
mic: ags-jsd-1600a(a) 
  
 
 
 
 
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dvr 4ch 
no power supply (dc 12v)