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A bar code reader is a device used for reading (decoding) bar-coded data. It may be a hand-held scanner, or may be embedded in a stationary scanner. It scans a bar-code image and converts into and converts in into a alphanumeric value, which is then fed to the computer to which the bar-code reader is connected. Just as though the alphanumerical value had been typed on a keyboard. A bar code reader uses a laser-beam scanning technology. The laser beam is stroked across the pattern of bars of a bar-code. Different bar codes having different patterns of bars reflects the beam in different ways, which is sensed by a light-sensitive detector. Reflected them transmitted to recognition logic circuits which convert in into an alphanumeric value.