Punch in your secret key into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad. pad size: 69.2 x 76.9 x 0.8mmcable length: 3 1 3 or 86mm include connectorconnector: dupont 7 pins, 0.1 2.54mm pitchmount style: self adherencemax. circuit rating: 35vdc, 100mainsulation spec.: 100m ohm, 100vdielectric withstand: 250vrms 60hz, 1min