4 port PoE + 1 Uplink port or 3 port PoE + 2 Uplink portThe fourth port can be used as a poe port or an uplink port according to your needs. Active poe switch with 802.3af/at compliantSTEAMEMO 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. 4 port poe switch*100M@52W PoE switch with 4 port PoE + 1 Uplink port, 4× PoE ports providing up to 30W per port, total PoE budget 52W, The fourth port can be used as a poe port or an uplink port1 port uplink ideal for connecting NVR and Internet, etc. 4KV Lightning ProtectionSTEAMEMO 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 t