Electronic and electrical systems and equipment are the focus of electrical engineering. The tools used by electrical engineers range from massive power generators to tiny computer chips. Nearly every area of society benefits from their work, including home theater entertainment systems, mobile phones, digital cameras, and television to improve our quality of life, medical imaging systems to improve healthcare, electrical appliances for homes, laboratory instruments, lasers for dependable high-speed communication, handheld multimedia devices to provide information on the go, and satellite systems for remote sensing of the environment and other things. Electrical engineers typically specialize in one of six fields, including instrumentation and measurement, computers, communication systems, electronics, and automatic control.