The wireless security cameras and the NVR require the power connection. They are not Battery Powered Cameras. WiFi security cameras means the cameras and NVR video transmission via wifi signal. Wireless security cameras are designed for continuous recording, which requires them to be plugged in to a power source, each camera have a power cord. TV or computer monitor is required for setup, pls note you can’t connect to your PC directly, you can download a client on PC after you set it up on a monitor. The NVR has to be wired connect to wifi router, it does’t support wifi connection.