Beschikbaarheid: In voorraad
This is the FeatherWing Proto - a prototyping add-on for all Feather boards. Using Feather Stacking Headers you can connect this FeatherWing on top of your Feather board. This has a duplicate breakout for each pin on a Feather, as well as a bunch of plain grid proto holes. For GND and 3.3V, it has a strip of connected pads. There's plenty of room for buttons, indicator LEDs, or anything for your portable project.
More information is available on the website of Adafruit.