This is a Power over Ethernet (PoE) expansion board for 3B+/4B that supports the IEEE 802.3af network standard. If you already have a PoE router or switch that supports the IEEE 802.3af standard, this expansion board allows you to connect and power your device using a single network cable. Compatible with 3B+/4B models, can be used with a case, and does not take up additional space. Supports Power over Ethernet (PoE), compliant with IEEE 802.3af PoE network standard. Features a fully isolated switch mode power supply (SMPS). Designed with a compact component layout for a smaller overall size and greater flexibility. PoE power input: 37V ~ 57V DC Power output: 5V 2.5A DC Network standard: IEEE 802.3af PoE Color: Blue Material: PCB Size: 65 x 32mm Package includes: 1 x PoE HAT Expansion Board Note: Light reflection and display differences may cause slight variations in color. Measurement error is +/- 1-3cm.