The POE HAT is a POE accessory with IEEE802.3af Over Ethernet(POE) standard for the 3B+/4B . The for can get and network from this POE HAT by using a RJ45 Ethernet cable. Easy installation and low cost(isolation type and minimum external device required). Feature: 1. 5V/2.4A Output with RJ45 port 2. Standard IEEE802.3 3. Isolated switched-mode supply 4. Support PoE applications in both of Fast / Gigabit Ethernet Environments 5. Short Circuit Protection, Over-temperature Protection 6. Programmable Classification (Default:Class 0) 7. Onboard cooling fan,low output ripple and noise 8. 1500Vrms Isolation (Input-Output) Specifications: 1. input: DC 37-57V 2. output: 5V/2.4A 3. POE standard: IEEE802.3 4. Working Environment: -20~55 5. Cooling: 25mm x 25mm brushless fan 6. Dimension: 6.5cm x 5.65cm x 2.4cm Material: PCB colour: black Package Contents: 1 x RPI POE module 1 x Screw package Only 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.