A sensor is a device that detects and responds to some type of input from the physical environment. The specific input could be light, heat, motion, moisture, pressure, or any one of a great number of other environmental phenomena. MicrophoneIt is a device that translates sound vibrations in the air into electronic signals or scribes them to a recording medium. Microphones work as transducers, converting sound waves (mechanical wave energy) into audio signals (electrical energy). Additional Information Devices with sensors are:A burglar alarm system :It consists of a series of electrical components that are connected to a property via sensors and contacts, they detect movement or the opening of doors and windows, upon which a loud alarm is produced to alert those nearby of unauthorized entry. Automatic street light control:It is used to control the street lights(Turn on and off based on the light)LDR sensor is used to control the switching action of LED street lights depending on sunlight conditionAnti-lock braking systemIt is a safety anti-skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. The ABS sensor is the main sensor that keeps the braking power of a car in check. Hence microphone is NOT a sensor device.