Waveshare Power Over Ethernet HAT for Raspberry Pi 3B+/4B, 802.3af Compliant with OLED real time monitoring temperature, IP, and fan status

POE HAT FOR RASPBERRY PI: Power Over Ethernet HAT For Raspberry Pi 3B+/4B, 802.3af-Compliant;OLED for real-time monitoring temperature, IP, and fan status For Use With Raspberry Pi 3B+/4B: Standard Raspberry Pi 40PIN GPIO Stackable Header, Allows Connecting Other HATs Power Over Ethernet:Providing Both Network Connection And Power Supply For Your Raspberry Pi In One Cable 0.91" OLED Display: 128 × 32 Pixels, I2C-Bus Controlled Monitoring Processor Temperature, IP Address, Fan Status In Real-Time; Onboard PCF8574 Chip:PCF8574 IO Expander For I2C Bus, Providing 8 IO Pins, Of Which P0 For Fan Control And Extra Spare Pins On Solder Pads (P1-P7, INT) Cooling Fan: Allows Auto Running On Powerup OR Programmable Control, Configured By Switch Automatically Turn On/Off Depending On The Raspberry Pi Processor Temperature