“So cute, so small, and so useful! This switch bridges the "run" pin of a raspberry Pico to the ground pin that's a couple of pins away so that you can easily reboot the Pico without having to disconnect the USB cable. It's really easy to solder it on to a Pico, and is exactly the same design as the "bootsel" button on the board already. You would normally solder it so that it was within the dimensions of the board, near the bootsel button. If you have added a Pimoroni "pack" (a display, for example), you can install it overhanging the edge of the board, so that it still is easy accessible.”
“Really simple, but also really useful if you need to frequently reset your Pico, e.g. to put it into mass-storage mode for programming without having to unplug and replug it.”