Features: The Power-over-Ethernet (POE) module offers a convenient and cost-effective way to deliver power to your device. The module lets you put a DC voltage on specific pairs of the Ethernet cable so that devices connected to the network can use it as a power source. The built-in cooling fan can automatically run under power or programmable control when the processor temperature is high. Its small size fits perfectly with Raspberry Pi 4B and 3B + in IOT and building automation applications. It provides clean and reliable power for Raspberry Pi 4B / 3B +. Protection circuits, Transient overvoltage, Undervoltage lockout, Thermal shutdown, Foldback current limiting. Specifications: PoE power supply: 37V~57V for DC in Output: 5V + -5% to 2.5A * Network standard: 802.3af PoE Size: app.30x30mm / 1.18x1.18 inches Note: No retail package. Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1Set x Raspberry Pi 4 Model B/3B+ POE network expansion board