Pimoroni PIM536 Flat HAT Hacker is a board designed to attach HATs and mini HATs to the Raspberry Pi 400. This board includes GPIO pins on the second landing area that are labeled with function and BCM pin numbers. The top row of GPIO pins are populated with a pre-soldered header to attach a HAT or mini HAT easily and without fuss. This board comes with an addition of the second set of contacts (with handy labels) to the middle of the board. The contacts can be used by soldering a 40-pin header onto these if two mini HATs need to be used at once. This Flat HAT Hacker features 10 mounting holes and a pre-installed right-angle 40-pin female connector for attaching to Pi’s GPIO.