This is a high-quality universal GPIO extension board compatible with Raspberry Pi 3/4 Model B making working easier because of its multi-functional module. You can simply click on them to insert a wire into them, it includes all the mounting hardware required to fix the board to your Raspberry Pi. We have a set of jumper caps, so you can distribute your signals to the edges of the connector. It is a multifunctional GPIO expansion board for your Raspberry Pi, providing an essential tool to make your experiment easier and more convenient.