Features: Used in conjunction with the ProtoShield prototype expansion board The circuit is used to build a prototype, can be directly soldered components on board;You can also connect the above mini breadboard circuit. Bread board and circuit board via double-sided adhesive connections, sold bread board and the circuit board are separated. ProtoShield prototype expansion board with two buttons and two LED circuit can be used directly All of the pin and power leads are very fit and build circuit prototyping with Ardui-no. Specifications: Model: ProtoShield Prototype Expansion Board With Mini Breadboard Size:Mixed Material: Metal+Plastic Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC Prototype Expansion Board With Mini Breadboard