Welcome to our store! 1. Applicable Models: This is a Power over Ethernet (PoE) mini expansion board for Raspberry Pi 3B+ 4B, supporting the IEEE 802.3af network standard. 2. Power Over Ethernet: Supports PoE power over Ethernet, allowing the Raspberry Pi to be networked and powered via a single network cable to a PoE device. 3. Fully Isolated Switch Mode: The mini expansion board features a fully isolated switch mode power supply (SMPS) and supports access to cooling fans. 4. Flexible: The expansion board has a more compact component layout, smaller overall size, and more flexible use. 5. PCB Material: The mini expansion board is made of PCB material, which will not deform over a long period, ensuring long-term stability. Item Type: POE Mini Expansion Board Material: PCB Model: PoE HAT (E) POE Input Voltage: 37V to 57V DC POE Output Voltage: 5V 2.5A DC Network Standard: 802.3af PoE Scope of Application: Applicable to Raspberry Pi 3B+ 4B 1 x POE Mini Expansion Board If you receive your item and find any product issues, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.