Crestron Green Light sensors deliver a powerful and cost-effective solution for reducing energy costs and enhancing the functionality of lighting and environmental systems. The GLS-OIR-W-2500 is a wall or ceiling mount occupancy sensor designed for large areas up to 2500 square feet to detect when the room is occupied. Advanced self-adaptive, passive infrared motion sensing affords excellent reliability for control of lighting, climate control and other devices in the room.