Microphones are used in a variety of applications across a range of industries, including consumer, industrial, and medical. While commonly used for audio recording or voice capture in products like cell phones or hearing aids, microphones can additionally be used to monitor voices and sounds. Examples of this include sound detection of glass breaking in security systems, sound recognition in baby monitors, or even microphones used as a sensor to detect unusual sounds in industrial machinery. Pairs of microphones are often used to record sounds in stereo, whereas arrays of MEMS microphones allow selective monitoring of sound sources while attenuating background noises. This can be useful when operating speakerphones in noisy environments.