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 network standard, with this expansion board, you can connect the to and power supply with just one network cable.Suitable for 3B+/4B, can be used with shell, does not take up more spaceSupport PoE Power over Ethernet, support IEEE 802.3af PoE network standardFully isolated switch mode power supply (SMPS).Adopting a more component layout scheme, the overall volume is smaller and the use is more flexiblePoE power input: 37V ~57V DC inputPower output: 5V 2.5A DC outputNetwork Standard: Support IEEE 802.3af PoEColour:blueMaterial:PCBSize:65 x 32MMPackage Contents:1 x Poe HAT Expansion BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.