The F3SG-4RE1040P14 Photoelectric Switch w/Safety Light Curtains manufactured by Omron is a type 4 interlocking safety device for control and protection of equipment. It features a safety light curtain that is designed to detect and guard against unauthorized access to dangerous areas. The light curtain has a height of 402 mm (15.83"), with 4 receiver beams and 4 transmitter beams for a total of 8 beams. It has a resolution of 14mm and a response time of 0.32ms per beam. The unit also features a transformerless 2-wire control circuit, a no-seepage function, and a power-on detection function. It has a safety relay output, and dual dual-channel redundant outputs for self-checking when connected to an external programmable logic controller (PLC). The product has an IP67-compliant waterproof rating and weighs about 2.4kg (5.3 lbs).