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 designs and delivers ceramic, film, electrolytic, and mica capacitor products for use in power supplies and medical implants; 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 markets. 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.