Features: Perfect 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, open or close the greenhouse vents as temperature rises or drops. Can be clamped onto or screwed onto your greenhouse frame. Please make sure your greenhouse window can be opened freely by at least 45cm (18"). Specifications: Greenhouse Window Opener Kit Maximum window opening 45cm Maximum opening about 30°, depending on adjustment and load Maximum opening weight 7kg/15lb Adjustable open temperature range 15°- 25°/60°-77F Package: 1# Automatic Window Opener Kit / Replacement Greenhouse Window Opener Cylinder (You can choose what you want) Notes: Do not use this opener anywhere the temperature will exceed 50° (122F) Please make sure your greenhouse window can be opened freely by at least 45cm (18") Do not apply excessive loads by locking or covering window Do not dismantle the cylinder The opener CANNOT stop by manual Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Features Automatic Temperature Control: This solar-powered greenhouse window opener automatically adjusts to maintain the ideal growing temperature, preventing overheating and ensuring optimal conditions for your plants. Solar-Powered Efficiency: Utilizes solar energy to open or close greenhouse vents as the temperature fluctuates, offering a cost-effective and eco-friendly solution for greenhouse ventilation. Versatile Mounting Options: Can be easily clamped onto or screwed onto your greenhouse frame, providing flexibility in installation and compatibility with various greenhouse setups. Wide Window Compatibility: Fits greenhouse windows that can be opened freely by at least 45cm (18"), offering broad compatibility for different greenhouse models. Essential Greenhouse Accessory: An indispensable addition to any greenhouse, this automatic window opener enhances ventilation and temperature control for improved plant growth.