Lutron MA-600I-WH Maestro Eco-minder 600-Watt Dimmer Eco-minder LED lets you know when you are saving 15% or more of energy As you dim your lights, the eco-minder LED moves from red to green. Extend bulb life at least 3x as compared to a standard switch when you dim 15% or more Same sleek features as standard Maestro dimmer Works for single pole or multi-location (must purchase the Maestro companion dimmer separately)