16-button keypad In form of 4X4 Matrix Ultra-thin design & adhesive backing provides easy integration to any project Easy communication with any microcontroller Cable included This 16-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 4x4 features a total of 16 buttons in Matrix form. This is a membrane keypad with no moving parts. A female 8-pin berg connector is provided for interfacing it with your microcontroller circuits. Convenient adhesive backing provides a simple way to mount the keypad in a variety of applications.