RPI-1035 is an SMT type, four-direction, phototransistor output, reflective optical switch manufactured by ROHM Semiconductor. This component utilizes two infrared-emitting diodes (IREDs) and four phototransistors in order to detect movement and positional changes of objects, including human bodies, animals, and robots. It allows a fast response time and can be used in various applications, such as object detection, motion detection, and industrial equipment sensors. The device is robust and reliable, providing excellent detection accuracy and stability. The RPI-1035 is available in an ultra-compact package and is RoHS Compliant.