In the food processing factory, due to the mechanical sound and the busy scene, it is impossible to immediately find the notice that affects food safety or the warning that causes the danger of the production environment, so it can be equipped with warning lights as a warning of on-site danger.

This warning light can also be installed outside the work area. For example, the temperature detection of the freezer is placed in the freezer, and the warning light can be placed in the quality control room. Even the global chain system can place temperature detection in central kitchens all over the world, and the warning lights are built in the headquarter office. This is the cloud system concept.

Warning lights are widely used and can be linked with other IoT devices.