30 days Hassle Free Return. Swann DVR and security cameras are designed to work with only certain models. NHD-819 - 4MP Super HD Security Camera.Q:What does "HDD" mean? A:HDD stands for a hard disk drive. It's a storage device that a DVR(digital video recorder)/NVR(network video recorder) needs to have in order to record video from connected security cameras. Some of our DVRs/NVRs do not come with a hard drive pre-installed(no HDD). For these units, you need to have your own hard drive to install. Q:Which cameras/recorders do I need to get for my system? If you have any questions, please don't hesitate to ask! A:Default password is "12345"username is "admin". 30 Days Hassle Free Return. The item "NHD-819 4MP Super HD Security Camera" is in sale since Saturday, April 6, 2019. This item is in the category "Consumer Electronics\Surveillance & Smart Home Electronics\Home Surveillance\Security Cameras". The seller is "miguelandken" and is located in Palm Springs, California. This item can be shipped to United States.