Wangdd22 UNO Proto Shield Prototype Expansion Board with SYB-170 Mini Breadboard Based for ARDUINO UNO ProtoShield 1 reset button, 1 general use button, and 2 LED circuits can be used directly. Prototype size: About 2.72*2.09*0.71" (69*53*18mm) Mini breadboard size: About 1.85*1.38*0.35" (47*35*9mm) All of the pins and the power leads are very fit and build circuit prototyping with Ardui-no. Arduino protoshield prototype with 170 mini breadboard