This DC 12V 4?1 Key Matrix Membrane Switch Keypad is a high-quality product at very low cost for your application needs.
This 4-button keypad provides a useful human interface component for microcontroller projects
The Keypad 1?4 features a total of 4 buttons in Matrix form. This is a membrane keypad with no moving parts. A female 5-pin berg connector is required for interfacing it with your microcontroller circuits.