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High-Quality Greenhouse Ventilation Automatic Window Opener with Enhanced Components. Temperature Sensing: Automatically adjusts window opening based on temperature changes. No Power Required: Operates without batteries or electricity using solar energy. Double Spring Design: Features a durable double spring structure for reliable operation. 5-Year Warranty: Comes with a comprehensive 5-year warranty coverage. Galvanized Steel: Constructed from galvanized steel for enhanced durability. Multiple Colors: Available in silver, black, blue, yellow, and red. Flexible Customization: Offers full, minor, and sample-based customization options. Fast Lead Time: Standard lead time of 15 days for both peak and off-peak seasons.