As its name implies, Sparton is big on defense. Working for aerospace, defense, and medical companies, the company provides contract electronics manufacturing services, primarily the design and production of electronic and electromechanical devices. Its products include printed circuit boards, sensors, and electromechanical components, as well as fully built systems and devices. The company also manufactures an anti-submarine warfare device called a sonobuoy for the US Navy and foreign governments. Sparton, which tracks its roots to 1900, generates most of its sales in the US.