Little clicky switches are standard input "buttons" on electronic projects. These work best in a PCB but can be used on a solderless breadboard as shown in this tutorial. The pins are normally open (disconnected) and when the button is pressed they are momentarily closed. They come in a pack of 20, they're pretty handy so you'll want to keep them around. You can find an EAGLE cad package for these in switch-omron:B3F-10XXTechnical details Downloads: Example 6mm tactile switch datasheet for dimension information Tutorials: Tactile button tutorial Product Dimensions: 6.0mm x 6.0mm x 5.0mm / 0.2" x 0.2" x 0.2" https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2023-03-06 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2023-12-27 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2024-09-19 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2024-11-29 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2024-11-30 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2025-11-28 https://elecena.pl/product/22713215/tactile-button-switch-6mm-x-20-pack 2025-11-29