1、High Compatibility: Suitable for RPi 1A+ 1B+ 2B 3B 3B+ 3A+ 4B and many other 40pin for RPi models to meet different user needs. 2、Convenient Connections: Easily connect for RPi GPIOs and power supplies to peripheral devices via 8 RJ45 sockets, providing a full range of expansion capabilities for your for RPi. 3、Flexible Power Supply: Each RJ45 port supports independent selection of for RPi 5V 3.3V or blue terminal power supply to meet the power needs of external devices. 4、GPIO Pin Connection: Each of the 8 ports supports different interfaces such as UART, SPI, GPIO and I2C, making it easy for you to interact with more peripheral devices with for RPi. 5、Expansion Pin Design: Equipped with 2x20pin expansion pins, it is convenient for you to expand more peripherals of for RPi to meet more innovative and practical needs. Item Type: for RPi Breakout Board Material: PCB Number of RJ45 Ports: 8 Expansion Pin: 20pin x 2 Applicable Models: for RPi 1A+ 1B+ 2B 3B 3B+ 3A+ 4B RJ45 GPIO Interface. Port 1: UART(RXD TXD) GPIO17 GPIO4 Port 2: SPI(SCLK CE0 MISO MOSI) Port 3: GPIO6 GPIO12 GPIO5 CE1 Port 4: GPIO21 GPIO26 GPIO20 GPIO19 Port 5: I2C(SDA, SCL) GPIO18 GPIO27 Port 6: I2C(SDA, SCL) GPIO23 GPIO22 Port 7: I2C(SDA, SCL) GPIO24 GPIO25 Port 8: I2C(SDA, SCL) GPIO13 GPIO16 1 x for RPi Breakout Board