E3S-R1B4 is a type of photoelectric sensor made by Omron. It is a self-contained retro-reflective sensor, which uses a red LED light source and a built-in amplifier to detect objects up to a distance of 10 meters. This device is designed with a compact body and a protector, making installation and wiring especially simple. Its various models are rated for a wide range of applications, including high-speed detection, long distance detection and intense ambient light. The E3S-R1B4 also offers over voltage, over current, and short circuit protection, which ensures reliable and dependable performance.