?AI Watchdog function of poe port?When the data or power transmission between the poe port and the terminal device is abnormal, the corresponding poe port of the device will automatically detect the problem and restart the connection. ?AI 250 meters Extend function?Turn on the extension switch,it enters the AI mode,POE port will judge whether it enters the ultra-long distance (820ft/10Mbps) mode according to the actual situation).Extend function extending max power and data transmission distance from 100 meters(330ft) to 250 meters(820ft).which is easy to expand network via ethernet cable to somewhere without power supply but need fix device such as IP Cameras. ?4KV Lightning Protection?STEAMEMO PoE switch have professional lightning protection design-up 4KV port and power supply thunder prevents, with two levels of protection design respectively, effectively restrain the power of lightning from cable, which equivalent to give the entire network monitoring system with a security fence. ?8 port poe switch*100M@120W ?PoE switch with 8 port PoE + 2 Uplink port,8× PoE ports providing up to 30W per port, total PoE budget 120W,2 port uplink ideal for connecting NVR and Internet, etc. ?Active poe switch with 802.3af/at compliant?STEAMEMO poe switches support poe devices and non-poe devices, But when connecting passive poe device or non-poe device,the switch can only transmit data and cannot power your device,so the connected device needs to be separately powered. Or you can use it with active poe splitter.