Feature: 1. GOOD COMPATIBILITY: Prototype expansion development board, with 170 jacks design, equipped with breadboard, has good compatibility. 2. MAIN PURPOSE: Used to build circuit prototypes, you can solder components directly, or connect circuits through a mini breadboard. 3. SIMPLE STRUCTURE: Expansion board with 2 LEDs and 2 button circuits, all pins and power are drawn out, can be used to build circuit prototypes. 4. EASY TO USE: Components can be soldered directly on the board, or through a small circuit board above, which is connected by double sided tape. 5. DURABLE MATERIAL: Using excellent resin material, with high and low temperature resistance, not easy to age or corrode, has long service life. Specification: Item Type: Mini Breadboard Material: Resin Working Voltage: 3-5V Circuit Board: SYB-170 Features: Expansion board with 2 LEDs and 2 circuit buttons . Package List: 2 x Modules2 x Breadboards Note: Please pay attention to electricity safety when installing.