Ideal for your greenhouse window-opens and closes your greenhouse window as the temperature changes automatically. maintains the best growing temperature and prevents your greenhouse from overheating. Easy to install and use. - Material: Metal and Plastic. - Made of premium material. very sturdy and durable. - Ideal for your greenhouse window--opens and closes your greenhouse window as the temperature changes automatically. maintains the best growing temperature and prevents your greenhouse from overheating. - Non Electric. uses solar energy.or close the greenhouse vents as temperature rises or drops- Portable and compact. very space saving. - Can be clamped onto or screwed onto your greenhouse frame. Notice: - Do not use this opener anywhere the temperature will exceed 50 C. - Please ensure your greenhouse window can be opened freely by at least 45cm. - Please make sure that your greenhouse windows canfreely and there are no obstacles. - The maximum weight of the ventilation window does not exceed 7 kg. Quantity shipped: 1 piece Product color: black Product size: about 33.5cm long When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it