Please note : This cctv system not include the hard drive, this camera cannot support audio function [Easy setup] Wireless means camera and NVR is wireless connection, camere (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. Support connect router by 2.4Ghz WIFI network or router by ethernet cable. Finally power on and serve yourself with 24/7 surveillance, true plug and play. [AI Human Detection] Reduces false alarms — Compared with the traditional motion detection alert, the Hiseeu 3MP camera adopt more advanced AI human detection technology in 2021.