Automatic DesignThe automatic window opener opens and closes your greenhouse window as the temperature changes automatically, maintaining the best growing temperature and prevents your greenhouse from overheating. Solar EnergyUsing the solar energy, instead of electric, open or close the greenhouse vents as temperature rises or drops. Save your energy and time, and no need for human operation. CO2 FriendlyThe window opener will be very environmental and CO2-friendly throughout its whole lifetime because there is no need of electricity in your greenhouse. Easy InstallationThe window could be clamped onto or screwed onto your greenhouse frame. Please ensure your greenhouse window can be opened freely by at least 45cm (18). Do not apply excessive loads by locking or covering window. Hydraulic Cylinder with WaxOur core technology is the hydraulic cylinder that contains a plant-based wax, works as the greenhouse window openers thermostat, thus there is no need for electrical power supply. 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 dont 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