Swann NVR and security cameras are designed to work with only certain models. Please contact us to let us know what NVR/security camera you have before purchase to make sure it will work with your system. Swann SRNHD-815CAM 3MP Super HD Network Security Surveillance Camera Nhd 815 Compatible with Swann NVR-7300 or NVR-7400 only! Pls check compatibility before you place the order. Replacement Camera only ,no manuals ,cables or accessories included. To the installer VERY IMPORTANT: If you are using an used NVR , and if the camera doesn't connect after 2-3 min, please make sure you reset the NVR to the default settings, or release the IP address from the old cameras, otherwise, the camera will not work, because the NVR memorize the IP from the old camera. If you have difficulties with the setup you can also you can call Swann customer service ,free 24/7 at phone number 18006272799,and they are able to help you with the setup.