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.