This keyboard has 16 keys arranged in a 4×4 grid for phone lines and connected into a matrix controlled By 8 microcontroller pins
This small and compact 4×4 keypad module is easy and convenient to carry, and the contact resistance (<100 ohms) makes it comfortable and soft to the touch
This module is compatible with microcontrollers such as AVR and PIC, which makes it a perfect choice for your applications and projects.