Adafruit Membrane 3x4 Matrix Keypad + Extras

Key Features 12 button keypad 3x4 grid Only requires 7 microcontroller pins Thin, flexible material with adhesive backing 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.Includes a 7-pin extra-long header strip so you can plug this into a breadboard with ease.Item Specifics1 - 3x4 Matrix1 - 7-pin 0.1" pitch connectorWeight: 7.5 gramsKeypad dimensions: 70mm x 77mm x 1mm (2.75" x 3" x 0.035")Length of cable + connector: 85mm