Perfect for your greenhouse window - Opens and closes your greenhouse window. Automatically maintains the best growing temperature as the temperature changes and prevents your greenhouse from overheating. Non-electric, uses solar energy, opens or closes greenhouse vents depending on the temperature or temperature. Includes fittings and installation manual. Can be clamped or screwed onto your greenhouse. Important Notice: Do not use this opener in areas where the temperature exceeds 50°C (120°F). Please ensure your greenhouse window can be opened freely by at least 45 cm (18 inches). Do not apply excessive load by locking or covering the window. Do not disassemble the cylinder. The opener CANNOT stop manually. Greenhouse Window Opener Kit Color: Silver Black Material: Aluminum Alloy Fully adjustable between 20 and 25 ° C Maximum window opening: 45 cm / 18 inch Size: 38 x 9.5 x 9.5 cm / 14.96 x 3.74 x 3.74 inch Package: 2 x Automatic Window Opener Kit Only the above package content,