This plug and play security system built-in WIFI module, with anti-jamming capability, safe and reliable. Say goodbye to the messing cables.The cameras are connected to NVR wirelessly,no Ethernet cables required for cameras. Automatic connection between NVR and IP cameras Note:The Wireless System does Not mean you can use it without any cables. You have to connect them to the power adapters for supplying power to cameras and NVR.The cameras do Not contain battery.