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Speakers Computer speakers, or multimedia speakers, are external speakers, commonly equipped with a low-power internal amplifier Microphones A microphone is an example of a transducer, a device that changes information from one form to another Uninterruptible power supply(UPS) An uninterruptible power supply (UPS), also known as a continuous power supply (CPS) or a battery backup is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available. BATTERIES A battery is a combination of two or more electrochemical cells which store chemical energy and make it available as electrical energy.