Key benefits Provides a compact, ready-made input interface for single chip microcontroller projects. 4x4 matrix layout delivers 16 distinct buttons for menus, numeric entry, and control functions without extra wiring. Small footprint saves panel and PCB space and simplifies integration. Designed as an external keyboard module for microcontroller systems, making prototypes and final products easier to build and maintain. What it does 4x4 button design (total 16 buttons) arranged as a matrix for efficient scanning by a microcontroller. Acts as an external keypad that connects to a single chip microcontroller to handle user input, navigation, and command entry. Simplifies input wiring and firmware scanning logic compared with individual switches. Compatibility and connection Intended for use with single chip microcontroller systems and similar MCU setups that support keypad matrix scanning. Small, connector-ready module that is convenient to mount and wire into existing projects or enclosures. Designed for straightforward use in applications where a compact external keyboard is needed. Size and practical advantages Compact module saves space on panels and inside enclosures. Reduces assembly time versus wiring 16 separate switches. Easy to replace or upgrade as a single unit if needed. Typical applications DIY and prototyping: add a 16-button input to microcontroller breadboards and development boards for quick testing and control. Embedded control panels: provide menu navigation and numeric entry on compact devices that use a single chip microcontroller. Security and access systems: implement PIN entry or simple control inputs where a small external keypad is required. Why choose this module Purpose-built for microcontroller input tasks with a proven 4x4 matrix layout. Saves space, wiring, and integration effort compared with individual pushbuttons. Practical choice for anyone needing a compact external keyboard for single chip microcontroller projects.