Features: Premium Construction: Reliable, premium quality galvanised steel automatic window opener for greenhouses, durable for long time use. Heat Sensitive: The greenhouse window opener does not require battery or power supply. The window opener automatically opens and closes the greenhouse window automatically when the temperature changes. Greenhouse Helper: With the help of heat sensitive, the opening of the greenhouse opens or closes when the temperature rises or falls. Suitable for use in gardens, greenhouses, roofs, etc. to ensure indoor ventilation. Universal Design: Thanks to its lightweight and practical design, the automatic window opener for greenhouses can be easily assembled and disassembled. Intimate Service: If you have any questions about our products, please feel free to let us know. We will provide you with quality service. Specifications: Material:Galvanized steel Fit: for Greenhouse 1 Set *Automatic Window Opener