Knowles knows electrical products and components. Developing the microphone and receiver for hearing aids in 1954, Knowles Corporation continues to make those products, along with volume controls, trimmers, switches, telecoils, and other components used in aerospace, computer, instrumentation, medical, military, and telecommunications applications. The company also makes speakers and receivers used in mobile handsets, smartphones, and tablets. Its operations are divided across two segments: Mobile Consumer Electronics (MCE) and Specialty Components (SC).