Available in many configurations:1x4 4 buttons in a straight line,  69 x 20 x 1 mm.3x4 matrix 12-key membrane keypad DWT-0263: numbers, hash and asterisk keys. 76 x 69 x 1 mm.4x4 matrix 16-key membrane keypad DWT-0259: numbers, hash, asterisk and A,B,C,D function keys,  76 x 69 x 1 mm.4x5 matrix 20-key membrane matrix: numbers, 4 arrow keys, Enter ESC, F1 F2 function keys, hash and  asterisk, 85 x 73 x 1 mmFeatures: self-adhesive layer by 3m on bottomLife span: 100 million times For 3.3 V and 5V Controller suitable Dielectric strength: 250 VRms (50 ~ 60 Hz 1 min) https://elecena.pl/product/17485391/membrane-keypad 2021-03-29 https://elecena.pl/product/17485391/membrane-keypad 2022-08-26