Welcome to our shop! This Button Key Module comes with 8 buttons arranged in a 2 x 4 matrix. Each button is independent and does not influence each other, ensuring stable performance. It is also a micro switch. This keypad module is designed to simplify operation when installed on a single chip microcomputer. It is made of premium materials, ensuring good durability and efficiency. It is very sturdy and can be used for a long time. The module is lightweight and comes with pin headers and installation holes, making it very easy to install. Item Type: Button Key Module Specification: 2 x 4 matrix keyboard Function: External expansion keyboard of single chip microcomputer Board Size: Approx. 34 x 32mm / 1.34 x 1.26in (excluding protruding parts) 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.