This 4×3 Matrix Membrane Keypad has 12 buttons and arranged in a telephone-line 4×3 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 everything.
Length of cable + connector: 93mm
7-pin 0.1″ pitch connector
Keypad dimensions: 68.5mm x 76.5mm x 1mm
Weight: 7.5 grams"