Product overview This 2piece membrane keypad provides a compact, lowprofile input interface for microcontroller projects. Each keypad uses a 4 by 4 matrix with 16 keys and an 8pin connection for straightforward wiring and scanning. Key benefits Ready for prototyping and small production runs: two identical keypads in one pack for multiple projects or backups. Easy to integrate: 8pin matrix interface connects directly to general purpose I/O pins on common microcontrollers, using standard keypad scanning libraries. Spacesaving design: flat membrane construction and lowprofile layout fit into compact enclosures and panel cutouts. Clear, reliable input: distinct key positions and printed key labels simplify user interaction for menu selection, data entry, and control tasks. Costeffective and versatile: one keypad covers up to 16 inputs without using many GPIO pins thanks to the matrix layout. What it does 4x4 matrix layout providing 16 separate key inputs. 8pin output for row and column connections to microcontrollers. Membrane switch construction for a slim, sealed surface that resists dust and debris better than exposed mechanical switches. Compatibility and use Compatible with Arduino, AVR, and PIC microcontroller families when connected to available digital I/O pins. Works with common keypad scanning techniques and libraries for quick software setup. Practical applications User interface for an Arduinobased menu system, allowing navigation and numeric entry. Access control or keypad lock prototypes where a compact input panel is required. Remote control panels for robots, test equipment, or home automation prototypes that need multiple inputs without many GPIO lines. What you get Two membrane keypads, each with a 4x4 layout and 8pin connector. Standard pin arrangement suitable for direct wiring or ribbon cable connection to development boards. Notes for integration Standard matrix scanning requires assigning four pins to rows and four pins to columns on your microcontroller. Use existing keypad libraries for Arduino and similar platforms to detect presses and debouncing. This 2pack of 4x4 membrane keypads delivers a simple, compact way to add 16button input panels to microcontroller projects while keeping wiring and board space efficient.