The VALUE Gigabit PoE Injector is a so-called PSE, a unit to supply power for e.g. surveillance cameras, and LAN devices such as access points, bridges and routers over Ethernet cable.
A PSE supplies the current together with the data in the network cable. It doesn't need no longer an additional own power supply of the device.
VALUE 21991498, Fast Ethernet, Gigabit Ethernet, 10,100,1000 Mbit/s, IEEE 802.3af, IEEE 802.3at, Black, Activity, Link, PoE, Power, 55 V
VALUE 21991498. Ethernet interface type: Fast Ethernet, Gigabit Ethernet, Ethernet LAN data rates: 10,100,1000 Mbit/s, Networking standards: IEEE 802.3af, IEEE 802.3at. Product colour: Black, LED indicators: Activity, Link, PoE, Power. Power over Ethernet (PoE) voltage: 55 V, Output power: 30 W