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Arduino provided terminals for the IO, convenient port connections. 3.81 posts quality, reliable, convenient and durable. Proto Shield in conjunction with the middle can be used as a prototype expansion board. Prototype extended area of double-sided PCB through hole connector, it can be welded on both sides of the front element. There is a patch on the back IO pads, easy fly line connection. The intermediate portion can be placed a small bread plate, to facilitate expansion of experiment. Size:74*63*19mm(L*W*H). Weight:30.2g. Package Included: 1*Arduino Prototyping extension board Terminal prototype expansion board