The Miller Edge Non-Monitored Light Curtain is made up of a series of thru-beam photo eyes designed to provide a dense barrier of protection that, when interrupted, signals the door to stop and/or reverse. Light curtains are ideal for environments that require expanded protection for protruding parts that may not be detected by a standard single-beam photo eye mounted 6 inches from the floor. This UL 325 compliant monitored device has the ability to span up to 32 feet wide and comes in 3-foot and 6-foot models.