Intrinsically，scanners can be divided into red light and laser light.
The red light scanner transmits data by means of image-based shooting. It can not only read the paper-like physical barcodes under normal conditions, but also read the barcodes in mobile phones and computers through the screen. Relatively speaking, its application range is relatively wide.
The laser scanner is a light source refracted by a laser diode. It is refracted by the lens to the oscillator and then forms a light. The light is scanned and transmitted by aligning the bar code, also known as a tremor mirror.