The Metal Dome Keypad
The Metal Dome Keypad differs from the Mylar Dome in so far as the tactile feel is
obtained by inserting a metal dome in between the Graphic Overlay and the Lower Circuit. This then gives a more 'clicky' tactile sensation when the switch is pressed.
It offers a cost effective solution to those designers who want more of a tactile
feel. (However, due to the extra work and material will inevitably cost more than the Mylar Dome Keypad).
Again, with an operating life of greater than one million closures, this is a very
frequently chosen option.