This device is a light-emitting evacuation guidance line that can mark an escape
route so that people can evacuate quickly and accurately under thick-smoky and
dark environments in various disaster sites.

Light lines are available on the market in two main types: two-way and one-way communication systems. The two-way signal communication lightline consists of a main unit and a controller installed at the tail end of the lighting cable, both of which can send and receive signals from either direction.

In environments such as construction sites, where continuous signal interaction is required, a two-way system offers clear advantages. However, in emergency evacuation scenarios—especially where large numbers of people must be guided quickly and safely—a long one-way lightline (e.g., 100 m or 200 m) with directional indication functionality can be more effective.

The Korean company DAEHWA Inc. specializes in the production of one-way lightlines. This more traditional system primarily transmits signals in a single direction—from the main unit to the end of the lighting cable.