Welcome to our shop! We are excited to introduce our small and simple expansion board that offers maximum practicality. This expansion board is designed with clear markings, making your wiring simple and convenient to use. It is professionally manufactured with high precision, ensuring a long service life. Our expansion board will lead out all the pins, making it very convenient for wiring and experimenting. It is manufactured with the highest quality materials, and we strictly follow factory quality control guidelines. This expansion board is 100% brand new and comes in a combination board design. The input voltage is DC5V. The item includes 5 expansion boards. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.