NKK Switches KP04 Illuminated Surface Mount Pushbuttons are SPST momentary switches with RGB and RGBW illumination options. These switches feature several configuration options, including tactile and nontactile variations, and a variety of cap sizes and types. NKK Switches KP04 Illuminated Surface Mount Pushbuttons are optimized for surface mount reflow soldering, and feature momentary, normally open switching with a stroke of 3.5mm.