The Omron A7C-2PA-1 is a relatively small, low cost photoelectric switch designed for automated object detection and motion control. This switch uses a photocell or light-receiving element inside a plastic housing to detect the presence and absence of an object. The switch is basically a self-contained infrared (IR) sensor that transmits and receives infrared light, and has a built-in amplifier to help provide an accurate signal. The switch can be used to detect objects within a range of 5-20 cm, making it ideal for applications such as material handling, robotic systems, and other automation tasks. The device is also compatible with standard industrial control systems, such as PLCs, to further enhance its capabilities.