The BTNK0230 is a yellow, snap-on button for C&K's KSA series sealed tact switches. This component provides the user interface for the switch, featuring a round shape with a nominal diameter of 8.0 mm and a height of 4.5 mm. The 'K02' in the part number designates its style, while '30' specifies the yellow color. It is designed to be ordered separately and snap-fits onto compatible switches. Please note that this button is not RoHS compliant, and its compliance status should be verified for the intended application.