The 22 matrix keypad module usually is used as input in a project. It has 4 keys in total, which

This is 4×4 Matrix 16-Key Keyboard Keypad Telephone Style. It is 16 Button Keypad switch, ideal for code or data

This 4×5 Matrix Array 20 Key Membrane Switch Keypad Keyboard is a high-quality soft-touch feeling button keypad with 100 million

This DC 12V 4×1 Key Matrix Membrane Switch Keypad is a high-quality product at very low cost for your application

The Impact Switch Collision Switch Sensor Module for Arduino is leading installation module of the collision. This is low output