1×4 Matrix 4 Key Switch 1*4 Keypad

From the shop's description

DC 12V 1×4 Key Matrix Membrane Switch Keypad is a high-quality product at a very low cost for your application needs. This 4-button keypad provides a useful human interface component for microcontroller projects. Convenient adhesive backing provides a simple way to mount the keypad in a variety of applications. The Keypad 1×4 features a total of 4 buttons in Matrix form. This is a membrane keypad with no moving parts. A Male 5-pin berg connector is required for interfacing it with your microcontroller circuits. Features : Ultra-thin design & adhesive backing provides easy integration to any project Excellent price-performance ratio Easy communication with any microcontroller This allows a microcontroller to ‘scan’ the 5 output pins to see which of the 4 buttons is being pressed. Package Includes : 1 x DC 12V 1×4 Key Matrix Membrane Switch Keypad.