The Allen Bradley Guardmaster GuardShield Safe 4 is an economical two box, type 4 safety light curtain with ON/OFF functionality. This basic, guard-only operating mode, safety light curtain has an integrated laser alignment system that simplifies the alignment of each pair of light curtains. Visible laser beams are activated by touching the laser at the finger symbol on front face of the light curtains. Positioning of the transmitter and receiver laser beams to their respective targets facilitates optimal alignment of each Safe 4 pair. The integrated laser alignment system also quickly helps with the re-alignment of pairs when units are knocked out of alignment during the course of the work process or when corner mirrors are used.