That is what a handshower CCD? It is a bar code reader who can not read the code remotely. The user must be glued to the code to be able to read it.
This technology is very popular among traders who have cadenciers on A4 sheet. They use it in the office to differentiate products for example. One hand shower Imager or laser would be less accurate and might read the first met bar code.
This handshower CCD, in pasted code, therefore guarantees to take good!
The 1 benefit of this technology is its cost: these are the less expensive models.
The 2nd benefit is the longevity of the handshower: the mechanism has no moving parts, this ensures a greater life expectancy in the drive.