This is a PSE802G Gigabit Power over Ethernet Injector. This is used when you want PoE but you don't have or want the router or switch. This can save a substantial amount of money over buying a new switch or router for one device that is far away or high up in a roof or basement where there is no access to electricity.
The input is AC 100-240v at 50/60hz which handles all world electrical systems. The output is DC48V, Max 30W.
The power Pin is Mode-A 1,2(+), 3,6(-). (This is typical.)
Part Number P/N: 5-POE-INJCT-48
This model has heat vents and is for indoor use only.