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Hi Jerr. Sorry, this camera is not compatible with the NVR8-7400. That NVR model was manufactured over 8 years ago and we no longer sell the cameras for it. You may still be able to find some older stock online from other sources if you try searching for camera model codes NHD-818CAM, NHD-815CAM or NHD-816CAM. -SD, Swann Team
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