IR Break Beam Sensor Counting Module — 3mm LED, NPN Output, DC 5–24V, Arduino (1 Pair)IR Break Beam Sensor Counting Module 3mm LED, NPN Output, DC 524V (1 Pair) This infrared break beam sensor pair consists of an IR LED emitter and a photoelectric receiver when an object passes between them and breaks the invisible IR beam, the receiver output changes state. With a 2ms response time and detection range up to 100cm, it's ideal for object counting, conveyor position detection, and security beam applications. NPN output with switchable