The Pro-face EZ-series Stack Light (with Base), model PFXGP4106W1D, is a compact, multi-color indicator tower designed for seamless integration with human-machine interface (HMI) systems. It is engineered for direct mounting onto fixed panels, providing highly visual status alerts in industrial automation environments. Featuring a standard USB interface, this stack light connects directly to compatible Pro-face EZ-series HMIs, allowing for straightforward configuration and control without the need for complex wiring or additional I/O modules. Its tri-color LEDs (typically red, yellow, and green) enable clear signaling of various machine or process states—such as normal operation, warnings, or faults—enhancing operational awareness and efficiency on the factory floor. The integrated base ensures stable installation, making it a reliable and user-friendly solution for real-time visual notification in manufacturing and control applications.