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This button keypad provides a useful human interface component for microcontroller projects. There is convenient adhesive backing to provide a simple way to mount the keypad in a variety of ultra-thin design. Adhesive backing. Excellent price/performance ratio. Easy interface to any microcontroller. Example programs provided for the basic stamp 2 and propeller p8x32a microcontrollers. Application Ideas. Security systems. Menu selection. Data entry for embedded systems. Key specifications. Maximum rating: 24 VDC, 30 MA.