KEYPADS
Keypads can be designed for outdoor use, rugged conditions, vandal-proof situations; for all types of applications such as door-openers, alarms, sprinkler control, or even electric fences!
Keypads can consist of a single button, up to 16 keys and more. 
Indicator LEDs can be included on the panel as well as a piezo to indicate when a button has been pushed. 
The following 3 keypads show some of the styles: