Features: This is a replacement cylinder for automatic window opener. High sensitive, automatic respond to weather changes, so you don't need to stay near the greenhouse. Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Great for most greenhouse to open or close window automatically. Time and labor saving, also can supply a better temperature condition of plant's growth. Specifications: Condition: 100% Brand New Material: ABS Color: Black Temperature Range: 20-25℃ / 68-77℉ Size: Approx. 33 x 1.5cm / 12.99 x 0.59in Weight: Approx. 117g Maximum Opening Distance: Approx. 45 cm / 18in Adjustable Length: Approx. 33-45cm/ 13-18in Application: For Under 14 Kg Window Package Included: 1 x Window Opener Cylinder Only Features Efficient Replacement Cylinder: This cylinder serves as a high-quality replacement part for automatic window openers, ensuring smooth and efficient operation without the need for frequent maintenance or repairs. High Sensitivity and Automatic Response: The sensor is highly sensitive and automatically responds to weather changes, allowing you the freedom to manage your greenhouse without constant monitoring. Solar-Powered Non-Electric Design: Utilizing solar energy, this temperature sensor eliminates the need for electricity, offering an eco-friendly solution that efficiently opens or closes greenhouse vents based on temperature fluctuations. Universal Application: Suitable for most greenhouse setups, this sensor is designed to automatically regulate window openings, enhancing ventilation and maintaining an optimal climate for plant growth. Time and Labor Saving: By automating the window opening and closing process, this sensor saves time and effort, while also providing an ideal temperature environment for the growth of plants.