1.This GPIO terminal expansion board expands the Raspberry Pi's 40Pin pin, with obvious silkscreen hints on the right side of the expansion board, and LED light displays. There are 4 sets of wiring terminals on the left side of the expansion board. The DuPont wire is not easy to fall off and is very stable. 2.It facilitates everyone to connect when doing electronic experiments. The spacing between terminals is 3.5mm. Wire specifications range from 16 to 26AWG and stripping length is 5mm. There are GPIO pin output information on the and sides of the terminal. 3.Displays the status information of the PIN. When the GPIO pin is operated and active in the terminal, the LED matrix on the right side of the terminal will display the status of the GPIO PIN and make some distinctions in the color selection of the LED light. 4.You can know the status information of the pin by whether the LED lights of various colors are on. Different colors to display different types of pin states. 5V power supply light is red. 3.3V power light is orange. Special function pin indicator light is blue. The normal GPI0 pin indicator is green.