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Concave Button - Red Botland - Robotic Shop
Mini Button Pad Set - White - COM-08998 - SparkFun Electronics
Button Pad 4x4, Silicon Rubber, LED Compatible (COM-07835) - Proto-PIC
Buy Panel for 4x4 keyboard - compatible with LED Botland - Robotic
Button Pad Hookup Guide - SparkFun Learn
Buy Panel for 4x4 keyboard - compatible with LED Botland - Robotic
sparkfun-electromechanical-buttonpad-4x4
Each button has a hole underneath that accepts either a 3mm or 5mm standard LED. The idea is that you can create a button interface of your choice with the ability to display simple colors under each button.
Button Pad 4x4 - LED Compatible (COM-07835)
Button Pad Hookup Guide - SparkFun Learn