Features: Offering from messy breadboard setups to organized PCB projects with its full 40pin GPIO . Features 154 prototyping holes arranged in spacing for component organization, labeled GPIO pins for connection, and pre soldered headers for immediate integration Ideal for electronics hobbyists and makers creating devices, robotics projects, or embedded prototypes requiring GPIO access. Suitable for circuit testing in workshops or home labs by securely mounting sensors, LED, and peripherals through its prototyping. This plastic board combines professional manufacturing with breadboard flexibility, complete with printed lane markers for simplified component alignment and permanent project builds. Specifications: Component:Plastic Size:Approx.3x6.5cm/1.18x2.56inch Package Includes: 1Pc Expansion Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.