Suitable for 4B / 3/2 Model B/ 1 Model B / Pi 1 Model A+. To kick off the HAT , we have this inspired plug in daughter board. It has a grid of 0.1 inch prototyping soldering holes for attaching chips, resistors, LED, potentiometers and more. The holes are connected underneath with traces to mimic the solderless breadboards you're familiar. There's also long power strips for +3V, +5V and Ground connections to the for Pi. The for prototype hat breadboard can provide a good prototype development platform. You can circuit on this breadboard. Combined with the function of the for GPIO pin to achieve many different functions, you can build an electronic experiment environment. Easy to assemble Prototype breadboard GPIO compatible With write-protect ID EEPROM Colour:red Material:PCB Size:6.5 x 5.6 x 1.3 cm Package Contents: 4x PCB 4x 2x20pin connectors 1x Screw Set Only the above package content, other products are not included. Note: Light 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.