Datasheet

This is an add-on prototyping Pi Plate from Adafruit, which can snap
onto the Pi PCB (and is removable later if you wish) and gives you all
sorts of prototyping features to make building on top of the Pi super
easy.
Note: This kit is best used for the Raspberry Pi Model A or Model B. You
can use it with any "2x20 GPIO type" Pi (A+, B+, Zero, Pi 2, Pi 3) but
only the 'top 26 pins' will be broken out for use
There's a big prototyping area, half of which is 'breadboard' style and
half of which is 'perfboard' style so you can wire up DIP chips, sensors,
and the like. Along the edges of the proto area, all the GPIO/I2C/SPI
and power pins are broken out to 0.1" stips so you can easily connect
to them. On the edges of the prototyping area, (almost all of) the
breakout pins are also connected to labelled 3.5mm screw-terminal

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