HiLetgo 2pcs Uno R3 Proto Shield Prototype Expansion Board with SYB-170 Mini Breadboard Based for Arduino UNO ProtoShield 2 Sets of UNO Proto Shield prototype expansion board with SYB-170 mini breadboard SYB-170 Mini Breadboard Based for arduino Compatible with UNO R3 The ProtoShield Prototyping Board comes with two LEDs and two pushbutton circuits that are ready to use, with all pins and power supplies present Used in conjunction with the Duemilanove ProtoShield prototype expansion board, the circuit is used to build a prototype Components can be soldered directly on the board, or through the mini breadboard above.The breadboard is connected to the circuit board through a double-sided adhesive