M18 DC Photoelectric Switches FA are compact M18 barrel type photoelectric switches for DC operation. This series includes M18 photoelectric sensors, 10-30VDC, models with axial and 90 degree optics, models with IR, red light and red light laser emission, red light emission for transparent object detection, metal and plastic housings, models with or without sensitivity adjustment, IP67 protection and UL and CUL approved.