What is most often used to indicate an incorrectly read bar code is an audible annunciator of some kind. A bell or tone or "uh-oh" sound alerts clerks that something read wrong.
In newer machines an error file is created that shows date and time plus till number /operator number where a scan fail has occurred . This can be used if there is a security request logged against the operation
either a color laserjet or an Hp 8500..
A burglar alarm is a warning device which is tripped off by the occurrence of a burglary, or the loud warning signal produced by such a device.
A burglar alarm is a warning device which is tripped off by the occurrence of a burglary, or the loud warning signal produced by such a device.
Such a device is called a siren.
Alarm
Animals earthquake
As a safety/warning device.
The name of the device that produces coherent light is LASER.
All vessels are required to have a sound producing device, such as a horn, whistle, or bell, that can be used to signal warnings or communicate with other vessels on the water.
A keyboard.
cpu
The audible warning sound, for your 2000 Chevy Cavalier, can be fixed by replacing the sounding device. The sounding device can be purchased at most auto-parts stores.