1With 8 Buttons: Including 8 buttons in 2 x 4 matrix arrangement, this button key module is also a micro switch. 2Individual Keys: All the 8 keys are independent and not influence each other, ensuring stable work performance. 3Simpler Control: Installed on single chip microcomputer, the keypad module will largely simplify the operation. 4Good Durability: Adopting premium materials, works with high efficiency, very sturdy and durable for long use. 5Easy to Install: Comes with pin headers and installation holes, the lightweight module is very easy to install.Item Type: Button Key ModuleSpecification: 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). .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }1 x Button Key Module