Easy Set-up: Simply connect the PSE(power sourcing equipment) and enjoy the convenience of a single cable to power and data for Raspberry Pi. Compact layout and small size: Suitable for most cases, also compatible with uctronics pi rack mount. Efficient Heat Dissipation: This UCTRONICS for Raspberry Pi 4 PoE hat is equipped with a brushless fan, and an aluminum heatsink for effectively dissipating heat. PoE+ hat: This PoE hat is fully isolated switch mode power supply (SMPS), maximum output power of 5V 4.5A. Input: 45-57V IEEE 802.3af/at Complaint, Class 4 PoE device. Power over Ethernet: This PoE+ hat is designed for the Raspberry Pi 4B/3B+ to meet increased power requirements.