Etymotic Research (ER) is a research, development and manufacturing company that is located in Elk Grove Village, Ill. The name of the company means 'true to the ear.' Established in 1983, ER s mission is to design high-fidelity products to measure, improve and protect hearing. ER has developed and patented some of the most innovative hearing technology available today. The company s products are used throughout the world by scientists, hearing practitioners, hearing-impaired consumers, professional and amateur musicians and others who insist on superior sound quality. ER has more than 85 patents and has another 60-plus patents pending, which cover instrumentation for audiometry, infant hearing screening, otoacoustic emissions, auditory brainstem response and real-ear measurement, as well as circuitry, directional microphones and other components for hearing aids and automotive applications.