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Knowles Corporation offers capacitors, radio frequency (RF) and microwave filters, balanced armature speakers, and medtech microphones in Asia, the United States, Europe, rest of Americas, and internationally. It operates in two segments, Precision Devices (PD) and Medtech & Specialty Audio (MSA). The PD segment focuses on the custom design and delivery of high performance capacitor products and RF solutions primarily serving the defense, industrial, medtech, and electrification/energy markets. The MSA segment designs and manufactures balanced armature speakers and microphones for the hearing health; and specialty audio applications that serve the medtech and industrial markets. The company manufactures and sells film, electrolytic, and mica capacitors that are used in medtech, defense, and industrial electrification applications. It serves the defense, medtech, electric vehicle, industrial, and communications 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.