GRSE18-N1122 is a Sick photoelectric sensor, a device that uses light waves to measure the distance between two objects. It has an integrated LED light source, a transmitter, and a receiver to detect the light emitted. The product is designed to be used in a wide range of applications, such as position and motion control, level sensing, object detection, and object recognition. It has a sensing range of 4 to 8 meters and can detect a target up to 8 meters away. It is IP67 rated for use in wet and dusty environments, and has an operating temperature range of -25°C to +70°C. The product is RoHS compliant, making it safe for use in Europe.