According to your needs, users can choose either wireless system or POE system. Both systems have their pros and cons. Wireless cameras can connect to network through WIFI connection, but WIFI cameras still need to connect power cables. Therefore, it’s important to inspect the installation area, making sure there is electricity outlet allowing a power adapter to plug in. Typically, the WIFI signal coverage is about 20-30 meters, ensuring the WIFI cameras will be installed within this coverage. 

On the contrary, the POE cameras can connect to a NVR/router up to 70-80 meters. This distance coverage can meet the requirement of almost medium and small video surveillance projects. When considering the reliability, apparently the hard-wired way is more reliable than WIFI. Bandwidth also should be taken into consideration, a WIFI camera complies 802.11 a/b/g standard can support 40Mbps, while a POE camera can support 100Mbps. Consequently, when choosing Wireless or POE system, it is essential to consider the environment and apply the suitable one.