Knowles 

Knowles Corporation offers capacitors, radio frequency (RF) filtering products, balanced armature speakers, micro-acoustic microphones, and audio solutions in Asia, the United States, Europe, other Americas, and internationally. It operates through three segments: Precision Devices (PD); Medtech & Specialty Audio (MSA); and Consumer MEMS Microphones (CMM). The PD segment designs and delivers film, electrolytic, and mica capacitor products for use in power supplies and medical implants; electromagnetic interference filters; and RF filtering solutions for use in satellite communications and radar systems for defense applications. The MSA segment designs and manufactures balanced armature speakers and microphones for the hearing health, audio, and True Wireless Stereo (TWS) markets. The CMM segment designs and manufactures micro-electro-mechanical systems (MEMS) microphones and audio solutions used in applications that serve the ear, mobile, TWS, Internet of Things, computing, and smartphones markets. The company serves the defense, medtech, electric vehicle, industrial, communications, and consumer electronics markets through original equipment manufacturers, their contract manufacturers, suppliers, sales representatives, and distributors. Knowles Corporation was founded in 1946 and is headquartered in Itasca, Illinois.