Feature 1This is a replacement cylinder for automatic window opener 2High sensitive, automatic respond to weather changes, so you don't need to stay near the greenhouse 3Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops 4Great for most greenhouse to open or close window automatically 5Time and labor saving, also can supply a better temperature condition of plant's growthSpecificationFeatures: 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. 117gMaximum Opening Distance: Approx. 45 cm / 18inAdjustable Length: Approx. 33-45cm/ 13-18inApplication: For Under 14 Kg Window Package Included: 1 x Window Opener Cylinder Only Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. 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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }3.No battery or electricity required, need to be refrigerated before use.