The ZPT-3528C-14-Z2 with SMD Photointerrupters - Slot Type - Transistor Output ROHS manufactured by Chau Light is an optoelectronic device used in industrial electronic circuits. It is an assembly consisting of an infrared LED light source and an integrated phototransistor, enclosed in a single package. This device detects small objects that pass through the beam of infrared light, when the object interrupts the beam, it triggers the phototransistor, which in turn can be used to control an external circuit. This component is compact and lightweight and designed to be installed in limited space. It is RoHS compliant and has a wide operating temperature range. It is also highly durable and highly reliable.