The Optek OPB900W55Z is a slot type optical sensor with logic output. It is designed to detect the presence of an object in a slot or gap. It features a 9.53mm slot width and a wire-out connection. The sensor has a wide operating voltage range of 4.5V to 24V and a low current consumption of 10mA. It has a fast response time of 1ms and a long life of up to 10 million cycles. The sensor is suitable for a variety of applications including industrial automation, robotics, and medical equipment. It is also suitable for use in harsh environments due to its robust construction and IP67 rating.