The QS18VN6D is a compact and versatile photoelectric sensor manufactured by Banner Engineering, designed for industrial automation and sensing applications. It belongs to the QS18 series, which is known for its reliable performance in detecting objects across various environments. The VN6D model specifically features a visible red LED light source for easy alignment and setup. It operates on a 10-30V DC power supply and provides an NPN (sinking) output, making it suitable for integration with industrial control systems such as PLCs (Programmable Logic Controllers).