Features: Durable Material: Greenhouse window openers are made of galvanised steel, weatherproof, durable and rustproof, durable for long time. Automatic Opening and Closing of the Window: The greenhouse window opener can be temperature controlled to open and close automatically. Keep your greenhouse at a appropriate temperature. Greenhouse Aid: The automatic greenhouse window opener opens and closes automatically by thermal temperature induction. Keep the plants at the optimal growth temperature. Easy to Use: Window openers are quick and easy to install for the windows of standard garden and greenhouses. Perfect accessories for greenhouse. Customer Service: If you have any questions about this product, please contact us in time, we will provide you with dedicated service. Specifications: Material:Galvanized sheet Fit: for Greenhouse 1 Set *Automatic Window Opener