I need to learn more about VELUX external roller shutters for roof windows. What are their main benefits, what power options are available (e.g., manual, electric, solar), and what material are the slats made from? Provide a concise summary of this information.
Navigate to the VELUX website. Locate the section or page detailing 'Rollläden' (roller shutters) or 'außen liegender Hitzeschutz' (external heat protection). Identify and list at least three key benefits of the external roller shutters. Identify and list all available power options for these shutters (e.g., manual, electric, solar). Identify the primary material used for the slats of the roller shutters. Synthesize the gathered information into a concise answer.
State at least three key benefits of external roller shutters (e.g., optimal heat protection, darkening, noise reduction, security, privacy). List all available power options, including electric and solar, and manual if found. State that the slats are made of robust aluminum. The information provided is specific to external roller shutters for roof windows.