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identify a person through a fingerprint, voice intonation or some other biological characteristics. for example: retinal identification devices use rays of light to identify the distince network of blood vessels at the back of the eyeball
most common type of display screen. LCD's are made up of two plates of glass seperated by a layer of substance in which light is manipulated. are essential to portable computers and desktops
source data entry technology based on a n identify tag bearing a microchip that specific code numbers are red by the radio waves of a scanner linked to a database
source data input device that uses light-sensing (optical) equipment to translate images of text, drawing, photos, and the like into digital form
data on a display screen or in audio or voice form. this kind of output is not tangible; it can't be touched
hardware that produces digitized sounds, raging from beeps and chirps to music
hardware that converts digital data into speech like sounds
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