We have purchased camera to add on to work with our wnvrC20 because 2 of our cameras quit working the cameras are dead it is still under warranty When we got the new cameras which we paid for ones of the new cameras it was missing the power cord also if there is anything youre able to help with on the cameras that went out it would be very appreciate this is the 3 rd night owl we own in the family if you guys cant get me the power cord do I just take it back to where it was purchased but I do have to say there tech-support its awesome I emailed them see what happens User's recommendation: Communicate early and understand that One model nvr has many cameras.