Features Compatible: These prototyping expansion boards are compatible with the R3. For use with Duemilanove protoshield prototyping shield. Ease of Use: The prototype board comes with two LEDs and two button circuits ready to use, all pins and power are present. Use for: These prototyping shields can be used to prototype circuits and can be soldered directly onto the board. Premium Performance: The board has good electrical conductivity and low resistance. Exquisite workmanship, each of our products is carefully designed and manufactured. Excellent After-sales Service: We provide you with high-quality after-sales service. If you have any questions, please feel free to contact us, and we will deal with it for you as soon as possible. Specification: Item Type:Prototype Expansion Board Fit for Arduino R3 Package List: 3 x Expansion Board Package List 3 x Expansion Board