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This is a very use prototyping extension board, similar to the Arduino proto shields, but it will pin extended to terminals, convenient to connect an external connection.Very simple board, nothing special, on a board with the reset button and D13 LED lamp, avoided because on extension board can t see the light on the Arduino and press under the condition of the reset button - and, of course, if it is Iteaduino don t have this kind of circumstance:) we have considered the stacked floor after operating experience, are optimize.