Knowles Corporation supplies capacitors, radio frequency (RF) and microwave filters, balanced armature speakers, and medtech microphones across Asia, the United States, Europe, the rest of the Americas, and other international markets. It operates in two segments: Precision Devices (PD) and Medtech & Specialty Audio (MSA). The PD segment focuses on 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 hearing health and specialty audio applications serving the medtech and industrial markets. The company produces film, electrolytic, and mica capacitors used in medtech, defense, and industrial electrification applications, and 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.