5piece set of 4 x 3 matrix 12key membrane switch keypads designed for easy replacement and rapid integration into electronics projects. Key benefits Compact 12key layout saves panel space while providing a full numeric and function keypad in a lowprofile design. Standard 4 x 3 matrix wiring simplifies connection and reduces required I/O lines on microcontrollers and key scanning circuits. Membrane switch construction offers a slim, flexible form factor that fits tight enclosures and overlays. Supplied as a set of five identical keypads for spare parts, multiple installations, or batch prototyping. What this product does Provides reliable, repeatable key inputs through a 4 x 3 matrix array, suitable for scanning routines in embedded systems and control panels. Functions as both a direct replacement for worn 12key membranes and as an input interface for designs. Key attributes Quantity: 5 pieces. Layout: 4 by 3 matrix array, 12 keys. Type: Membrane switch keypad. Form: Lowprofile, flexible keypad suitable for compact spaces. Interface: Matrix wiring compatible with common microcontroller scanning methods. Compatibility and installation Compatible with microcontrollers and development boards that support matrix key scanning, including typical Arduino and Raspberry Pi setups. Easy to wire into existing matrix circuits or prototype breadboards; no special drivers required. Practical use scenarios Electronics : a worn or damaged 12key membrane on small appliances, calculators, or handheld devices. Prototyping and DIY: Add a compact numeric keypad to custom controllers, hobby projects, or learning kits. Access and control panels: Implement a slim input surface for entry systems, menu navigation, or industrial control interfaces. Package contents Five identical 4 x 3 matrix 12key membrane switch keypads ready for installation.