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). Preinstalled 1TB Hard Drive & Cloud Storage:1Tb Hard Drive Pre-installed support 24 hours More than 45 days reliable video recording. 4 cameras can store 24 hours recording about 30 days. Cloud Storage is not free. Stunning 2K Ultra HD video & One Way Audio: 3.0MP presents 2304*1296 Mega Pixels about 1.5 times clearer than 1080P. Employing IP66 Waterproof metal material housing, cameras can be used indoor and outdoor. H.265+ Video Compression: Compared with H.264, H.265+ is able to double data compression ratio, while improve video quality with low bit-rate. Remotely Anytime & Anywhere and No Monthly Fee: Hiseeu wireless security camera system can work without network. Internet is only necessary when remote access from phone or computer