DC12V Power Plug-in & Easy Setup? Wireless means camera and NVR is wireless connection, camera(No battery) and NVR still need work with power cable. The wireless video security system is easy to setup and DIY installation (need DC 12V plug power supply), these WIFI cameras are paired with NVR at manufacturing site. Connect PC/TV monitor to NVR by a VGA/HDMI cable. Finally power on and serve yourself with 24/7 surveillance, true plug and play. Preinstalled 500GB Hard Drive & Cloud Storage? 500GB Hard Drive Pre-installed support 24 hours More than 15 days reliable video recording. 4 cameras can store 24 hours recording about 15 days. Cloud Storage is not free, as per your own needs choose the better choice. Stunning 2K Ultra HD video & One Way Audio? 3.0MP presents 23041296 Mega Pixels abou.