stereo system A system of audio equipment that is used to record, reproduce, or broadcast sound through separate channels in order to give a more realistic spatial effect reproduction, and usually has accessory equipment of two or more separate microphones as audio input, and of capability to feed two or more loudspeakers separately as audio output.last updated 05 Jan 2016 https://en.wikipedia.org/wiki/Home_audiolast updated 05 Jan 2016
television A device that has a screen and usually together with a sound system, and is designed to receive television signals and to convert the received signals into a series of images signals and accompanying sound signals for displaying a series of visible images on the screen and producing a series of sound output through the sound system continously.last updated 05 Jan 2016 https://en.wikipedia.org/wiki/Televisionlast updated 05 Jan 2016
video cassette recorder A device that is used to record the encoded video and audio signals of a program on a cassette of magnetic tape, and to play back the recorded video or television program, film, etc on the screen of television through converting the magnetic signal recorded on the tape back to the encoded video and audio signals of a program reversely.last updated 05 Jan 2016 https://en.wikipedia.org/wiki/Videocassette_recorderlast updated 05 Jan 2016