PoE Hat for Raspberry Pi 4B/3B+ - Compatibility and form factor: Standard 40-pin GPIO stackable header, designed for Raspberry Pi 3B+/4B and allows PoE HAT stacking with other HATs. Compact form factor suited for typical Raspberry Pi setups. - Power over Ethernet: IEEE 802.3af compliant PoE source to deliver both network connectivity and power over a single Ethernet cable, simplifying installation and reducing cabling. - Onboard 0.91 inch OLED display: 128 x 32 pixel, I2C controlled. Real-time monitoring of processor temperature, IP address, and fan status. - Integrated cooling fan: Auto runs on powerup or programmable control via a switch. Supports automatic on/off based on Raspberry Pi processor temperature. - Practical use scenarios: - Remote headless deployments such as network gateways or edge devices powered by PoE with single-cable convenience. - Edge computing or digital signage setups where space and cabling are limited. - IoT gateways or small servers in compact, space-constrained environments.