Knowles makes specialty electronic components — primarily high-performance capacitors, RF filters, balanced armature speakers, and MEMS microphones — for customers in medtech, defense, industrial, and energy markets. Knowles operates two segments: Precision Devices (PD), which makes high-voltage ceramic capacitors, specialty film capacitors, and RF microwave filters for defense, medtech, and industrial applications; and MedTech & Specialty Audio (MSA), which makes balanced armature speakers and microphones primarily for hearing aid OEMs. Knowles sells directly to OEMs and, particularly in industrial markets, through distributors. Key customers include WS Audiology and TTI, each accounting for roughly 10-11% of FY25 revenue. Knowles competes on technical performance and custom engineering rather than price — its components are deeply integrated into customer product designs, making switching costly. In defense, Knowles often holds sole-source positions on programs. In hearing health, Knowles and Sonion effectively operate as a global duopoly. Revenue is driven by design wins, which recur over the life of a customer product, and by manufacturing utilization, given the fixed-cost-heavy production base. A notable growth initiative is a specialty film capacitor line targeting pulse-power applications, including defibrillators, radiotherapy equipment, and defense systems. Knowles has also grown through acquisitions and maintains a strong balance sheet to pursue further M&A in specialty components.