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. Mainly, we wanted to use our tri-color LEDs to create a full RGB color for each button.
Each button has a conductive circle backing so that a switch can be created with exposed PCB traces. Button force is between 190 and 210grams activation force (nice tactile feel like on your TV remote).
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