The QS186LE is a miniature photoelectric sensor with a built-in amplifier from Banner Engineering. It has a narrow, polarized light source and a polarized receiver for precise background suppression. Its miniature size allows it to be used in space-limited applications. The QS186LE features long sensing distance, high environmental immunity, and a selectable background suppressor, making it ideal for challenging applications. It also has a teachable, multi-turn potentiometer, active infrared rejection, and an adjustable built-in filter, making it one of the most versatile photoelectric sensors on the market.