The OPB840W11Z is a reliable and efficient slotted optical switch designed by OPTEK TECHNOLOGY. Featuring an 890nm emitter and an NPN phototransistor output, this optical switch ensures accurate and precise sensing in a variety of applications. The slot measures 0.375" wide and 0.315" deep, providing ample space for optimum light detection. The switch comes with 24"/26AWG wires, allowing for easy and convenient installation. With its high-quality construction and versatile design, the OPB840W11Z is a top choice for professionals seeking reliable optical sensing solutions.