Features: Brand new and high quality Supports 802.3at PoE+ standard with a high output power of 5VDC/4A. Built-in controllable brushless fan delivering 2.2CFM for better heat dissipation. Fully isolated switched-mode power supply for better power efficiency. Suitable for RaspberryPi 4B/3B+. It supports 802.3at PoE+ standard with high output power of 5VDC/4A and the built-in controllable brushless fan can deliver 2.2CFM to cool the for RaspberryPi processor. Specifications: Model: IEEE802.3at-2003PoE Input voltage: 37-57VDC Output voltage: 5VDC/4A Fan: 25x25mm brushless fan Working temperature: 0-50 Note: 1.Please allow 1-3cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Expansion Board