VELUX ACTIVE measures parameters like indoor and outdoor humidity, CO2 levels, and temperature, and then automatically operates VELUX windows, blinds and shutters to ensure your indoor environment is optimum. The right mix of fresh, clean air, good moisture levels and a comfortable temperature – all provided in the most natural way by VELUX roof windows. Of course, they also close automatically when it rains. And because roof windows are located at the top of the house, where stale air tends to collect, the effects can be felt throughout the home. The interface for all this functionality is an app for smartphone and tablet. It gives you full control over settings and parameters for operation of your windows, and of course you can override the system’s algorithms at any time for manual operation.