The ITR20001/T24 is a Photo Interrupter Through Hole RoHS manufactured by Everlight. It is a compact, versatile, and reliable way to detect light, count objects, or measure distance in a variety of applications. This device consists of an infrared emitter on one side and a phototransistor receiver on the other side. The infrared beam is modulated when an object passes through the beam, causing the output of the receiver to change. It is RoHS compliant and halogen free, and it comes equipped with a long life emitter. The ITR20001/T24 has a wide operating temperature range from -25°C to +85°C, making it suitable for a variety of industrial applications.