The 4x4 Keypad Matrix (Red Button) is a versatile input device for electronics and robotics enthusiasts in Bangladesh. Featuring 16 soft-touch red keys arranged in a 4x4 matrix, it provides a simple way to add user input to projects. Commonly used with Arduino, PIC, Raspberry Pi, and other microcontrollers, this keypad is lightweight, easy to wire, and reliable for long-term use. Ideal for security systems, password entry projects, menu navigation, and automation systems, it’s a must-have component for hobbyists, students, and engineers.