11820 is a Waveshare Raspberry Pi 4 Model B Super Kit, which includes everything you need to get started with your own single-board computer. This kit includes the Raspberry Pi 4 Model B board along with a power supply, case, cooling fan, heatsink, 16GB microSD card, and HDMI (high definition multimedia interface) cable. It also includes a 7-inch touch screen along with eight other add-on boards including a 3D printing controller board, a capacitive screen controller board, a stepper driver board, a servo driver board, and a DC motor driver board. The kit also includes a set of instruction manuals along with a few demonstration projects. Overall, this complete kit is a great way to get started with Raspberry Pi and use the full power of its capabilities for a range of projects.