Cri-Regulite is a smart glass which allows you to control its light transmission. You can instantly control how clear or dark glass is, adjusting the light transmission manually or automatically. It is based on the Suspended Particle technology.
Microscopic light absorbing particles are dispersed within a thin film laminated inside the glass, making it dark. When voltage is applied these particles align and allow light to pass through, resulting in a wide range of controllable transparencies.