Item Descriptions:

Battery operated led fire emergency light exit sign green color

An emergency exit in a structure is a special exit for emergencies such as a fire
It is usually a strategically located (e.g. in a stairwell, hallway, or other likely place) outward opening door with acrash bar on it and with exit signs leading to it. The name is a reference to when they are frequently used, however a fire exit can also be a main doorway in or out.