Poe++ 90Watt 5-Port (1 Poe in - 4 Poe Out) Gigabit Poe Pass-Through Switch Poe

This product is a PoE Passthrough Switch, designed to operate by connecting its PoE IN port to a PoE-enabled switch or PoE injector. When connected, it works without the need for an external power adapter.

eBay