- C&K is a leader in interface and switch technology as well as smart card and high reliability connector products. C&K offers more than 55,000 unique part numbers that are built, priced and delivered as standard catalog items. C&K products include: low profile tactile switches, navigation switches, detect switches, pushbutton switches, rotary, switch lock and key switches, slide switches, toggle switches, DIP, illuminated switches, and sealed switches.