The KEYENCE PJ-V21 Safety Light Curtain Receiver & Transmitter EXT Unit is designed to provide efficient and reliable protection for industrial automation and motion control systems. This unit, featuring a solid-state sensor, is shielded and operates on DC current, ensuring stable performance in a variety of environments. The model PJ-V20 is compatible with surface mounting, offering a compact and versatile solution for your safety light curtain needs. With a single pole, single throw (SPST) contact form and a convenient connector termination type, this receiver and transmitter unit is straightforward to install and integrate into your existing systems. The package comes with everything you need for easy setup, and it's backed by the trusted KEYENCE brand, known for their quality and durability in industrial automation components.