Knowles Corp is engaged in the manufacturing of micro-acoustic microphones and balanced armature speakers, audio solutions, high-performance capacitors, and radio frequency filtering products. It operates in three segments; the Precision Devices segment specializes in the design and delivery of high-performance capacitor products and RF solutions, Medtech & Specialty Audio segment designs and manufactures microphones and balanced armature speakers used in applications and the Consumer MEMS Microphones segment designs and manufactures micro-electro-mechanical systems microphones and audio solutions used in applications. The majority of its revenue comes from the Consumer MEMS Microphones segment.