1.This is the GPIO header kit, include 4 type of 20x2 Pin s GPIO header. It can used for Raspberry Pi or other circuit board with GPIO 2.This expansion board can expand one GPIO pin to two 3.With 2 x 20pin double row connector, which increase the pin height to facilitate the connection between the expansion board and the Raspberry Pi 4.With 2 x 20pin bent row pin header, the GPIO direction is perpendicular to the, which is convenient for the connection between the Raspberry Pi and other devices 5.First solder the pins to the PCB, then insert it directly into the Raspberry Pi Specification: Name: GPIO Header Kit for Raspberry Pi colour: black Material: ABS+metal Package Contents: 36 x GPIO Header Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.