Features: Power-over-Ethernet (POE) module provides a convenient and cost-effective way to power your device. The module allows you to apply a DC voltage to specific pairs in the Ethernet cable, enabling network-connected devices to use it as a power source. The built-in cooling fan can operate automatically under power supply or via programmable control when the CPU temperature is high. Its small size makes it a perfect fit for Raspberry Pi 4B and 3B+ in IoT and home automation applications. It delivers clean and reliable power to the Raspberry Pi 4B / 3B+. Includes protection circuits: overvoltage protection, undervoltage lockout, thermal shutdown, current limiting with feedback. Package Includes: 1 Set x Raspberry Pi 4 Model B/3B+ POE Network Expansion Board Specifications: PoE Power Supply: 37V~57V DC input Output: 5V +-5% to 2.5A* Network Standard: 802.3af PoE Size: Approx. 30x30mm / 1.18x1.18 inches Note: No retail package. Please allow 0-1 cm error due to manual measurement. Ensure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you.